de5fa3a8a0
This test will generate random numbers of calls to some getpid syscalls, then establish an mmap for a group of events that are created to monitor these syscalls. It will receive the events, using mmap, use its PERF_SAMPLE_ID generated sample.id field to map back to its respective perf_evsel instance. Then it checks if the number of syscalls reported as perf events by the kernel corresponds to the number of syscalls made. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
677 lines
16 KiB
C
677 lines
16 KiB
C
/*
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* builtin-test.c
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*
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* Builtin regression testing command: ever growing number of sanity tests
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*/
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#include "builtin.h"
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#include "util/cache.h"
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#include "util/debug.h"
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#include "util/evlist.h"
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#include "util/parse-options.h"
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#include "util/parse-events.h"
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#include "util/session.h"
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#include "util/symbol.h"
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#include "util/thread.h"
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static long page_size;
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static int vmlinux_matches_kallsyms_filter(struct map *map __used, struct symbol *sym)
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{
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bool *visited = symbol__priv(sym);
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*visited = true;
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return 0;
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}
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static int test__vmlinux_matches_kallsyms(void)
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{
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int err = -1;
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struct rb_node *nd;
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struct symbol *sym;
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struct map *kallsyms_map, *vmlinux_map;
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struct machine kallsyms, vmlinux;
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enum map_type type = MAP__FUNCTION;
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struct ref_reloc_sym ref_reloc_sym = { .name = "_stext", };
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/*
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* Step 1:
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*
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* Init the machines that will hold kernel, modules obtained from
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* both vmlinux + .ko files and from /proc/kallsyms split by modules.
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*/
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machine__init(&kallsyms, "", HOST_KERNEL_ID);
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machine__init(&vmlinux, "", HOST_KERNEL_ID);
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/*
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* Step 2:
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*
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* Create the kernel maps for kallsyms and the DSO where we will then
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* load /proc/kallsyms. Also create the modules maps from /proc/modules
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* and find the .ko files that match them in /lib/modules/`uname -r`/.
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*/
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if (machine__create_kernel_maps(&kallsyms) < 0) {
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pr_debug("machine__create_kernel_maps ");
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return -1;
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}
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/*
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* Step 3:
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*
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* Load and split /proc/kallsyms into multiple maps, one per module.
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*/
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if (machine__load_kallsyms(&kallsyms, "/proc/kallsyms", type, NULL) <= 0) {
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pr_debug("dso__load_kallsyms ");
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goto out;
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}
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/*
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* Step 4:
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*
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* kallsyms will be internally on demand sorted by name so that we can
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* find the reference relocation * symbol, i.e. the symbol we will use
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* to see if the running kernel was relocated by checking if it has the
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* same value in the vmlinux file we load.
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*/
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kallsyms_map = machine__kernel_map(&kallsyms, type);
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sym = map__find_symbol_by_name(kallsyms_map, ref_reloc_sym.name, NULL);
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if (sym == NULL) {
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pr_debug("dso__find_symbol_by_name ");
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goto out;
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}
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ref_reloc_sym.addr = sym->start;
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/*
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* Step 5:
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*
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* Now repeat step 2, this time for the vmlinux file we'll auto-locate.
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*/
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if (machine__create_kernel_maps(&vmlinux) < 0) {
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pr_debug("machine__create_kernel_maps ");
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goto out;
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}
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vmlinux_map = machine__kernel_map(&vmlinux, type);
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map__kmap(vmlinux_map)->ref_reloc_sym = &ref_reloc_sym;
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/*
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* Step 6:
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*
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* Locate a vmlinux file in the vmlinux path that has a buildid that
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* matches the one of the running kernel.
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*
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* While doing that look if we find the ref reloc symbol, if we find it
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* we'll have its ref_reloc_symbol.unrelocated_addr and then
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* maps__reloc_vmlinux will notice and set proper ->[un]map_ip routines
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* to fixup the symbols.
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*/
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if (machine__load_vmlinux_path(&vmlinux, type,
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vmlinux_matches_kallsyms_filter) <= 0) {
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pr_debug("machine__load_vmlinux_path ");
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goto out;
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}
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err = 0;
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/*
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* Step 7:
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*
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* Now look at the symbols in the vmlinux DSO and check if we find all of them
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* in the kallsyms dso. For the ones that are in both, check its names and
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* end addresses too.
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*/
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for (nd = rb_first(&vmlinux_map->dso->symbols[type]); nd; nd = rb_next(nd)) {
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struct symbol *pair, *first_pair;
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bool backwards = true;
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sym = rb_entry(nd, struct symbol, rb_node);
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if (sym->start == sym->end)
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continue;
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first_pair = machine__find_kernel_symbol(&kallsyms, type, sym->start, NULL, NULL);
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pair = first_pair;
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if (pair && pair->start == sym->start) {
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next_pair:
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if (strcmp(sym->name, pair->name) == 0) {
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/*
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* kallsyms don't have the symbol end, so we
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* set that by using the next symbol start - 1,
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* in some cases we get this up to a page
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* wrong, trace_kmalloc when I was developing
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* this code was one such example, 2106 bytes
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* off the real size. More than that and we
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* _really_ have a problem.
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*/
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s64 skew = sym->end - pair->end;
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if (llabs(skew) < page_size)
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continue;
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pr_debug("%#" PRIx64 ": diff end addr for %s v: %#" PRIx64 " k: %#" PRIx64 "\n",
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sym->start, sym->name, sym->end, pair->end);
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} else {
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struct rb_node *nnd;
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detour:
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nnd = backwards ? rb_prev(&pair->rb_node) :
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rb_next(&pair->rb_node);
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if (nnd) {
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struct symbol *next = rb_entry(nnd, struct symbol, rb_node);
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if (next->start == sym->start) {
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pair = next;
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goto next_pair;
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}
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}
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if (backwards) {
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backwards = false;
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pair = first_pair;
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goto detour;
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}
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pr_debug("%#" PRIx64 ": diff name v: %s k: %s\n",
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sym->start, sym->name, pair->name);
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}
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} else
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pr_debug("%#" PRIx64 ": %s not on kallsyms\n", sym->start, sym->name);
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err = -1;
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}
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if (!verbose)
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goto out;
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pr_info("Maps only in vmlinux:\n");
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for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
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struct map *pos = rb_entry(nd, struct map, rb_node), *pair;
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/*
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* If it is the kernel, kallsyms is always "[kernel.kallsyms]", while
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* the kernel will have the path for the vmlinux file being used,
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* so use the short name, less descriptive but the same ("[kernel]" in
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* both cases.
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*/
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pair = map_groups__find_by_name(&kallsyms.kmaps, type,
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(pos->dso->kernel ?
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pos->dso->short_name :
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pos->dso->name));
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if (pair)
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pair->priv = 1;
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else
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map__fprintf(pos, stderr);
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}
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pr_info("Maps in vmlinux with a different name in kallsyms:\n");
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for (nd = rb_first(&vmlinux.kmaps.maps[type]); nd; nd = rb_next(nd)) {
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struct map *pos = rb_entry(nd, struct map, rb_node), *pair;
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pair = map_groups__find(&kallsyms.kmaps, type, pos->start);
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if (pair == NULL || pair->priv)
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continue;
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if (pair->start == pos->start) {
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pair->priv = 1;
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pr_info(" %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s in kallsyms as",
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pos->start, pos->end, pos->pgoff, pos->dso->name);
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if (pos->pgoff != pair->pgoff || pos->end != pair->end)
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pr_info(": \n*%" PRIx64 "-%" PRIx64 " %" PRIx64 "",
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pair->start, pair->end, pair->pgoff);
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pr_info(" %s\n", pair->dso->name);
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pair->priv = 1;
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}
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}
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pr_info("Maps only in kallsyms:\n");
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for (nd = rb_first(&kallsyms.kmaps.maps[type]);
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nd; nd = rb_next(nd)) {
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struct map *pos = rb_entry(nd, struct map, rb_node);
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if (!pos->priv)
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map__fprintf(pos, stderr);
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}
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out:
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return err;
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}
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#include "util/cpumap.h"
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#include "util/evsel.h"
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#include <sys/types.h>
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static int trace_event__id(const char *evname)
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{
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char *filename;
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int err = -1, fd;
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if (asprintf(&filename,
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"/sys/kernel/debug/tracing/events/syscalls/%s/id",
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evname) < 0)
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return -1;
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fd = open(filename, O_RDONLY);
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if (fd >= 0) {
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char id[16];
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if (read(fd, id, sizeof(id)) > 0)
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err = atoi(id);
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close(fd);
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}
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free(filename);
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return err;
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}
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static int test__open_syscall_event(void)
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{
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int err = -1, fd;
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struct thread_map *threads;
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struct perf_evsel *evsel;
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struct perf_event_attr attr;
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unsigned int nr_open_calls = 111, i;
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int id = trace_event__id("sys_enter_open");
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if (id < 0) {
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pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
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return -1;
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}
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threads = thread_map__new(-1, getpid());
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if (threads == NULL) {
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pr_debug("thread_map__new\n");
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return -1;
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}
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memset(&attr, 0, sizeof(attr));
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attr.type = PERF_TYPE_TRACEPOINT;
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attr.config = id;
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evsel = perf_evsel__new(&attr, 0);
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if (evsel == NULL) {
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pr_debug("perf_evsel__new\n");
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goto out_thread_map_delete;
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}
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if (perf_evsel__open_per_thread(evsel, threads, false, false) < 0) {
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pr_debug("failed to open counter: %s, "
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"tweak /proc/sys/kernel/perf_event_paranoid?\n",
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strerror(errno));
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goto out_evsel_delete;
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}
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for (i = 0; i < nr_open_calls; ++i) {
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fd = open("/etc/passwd", O_RDONLY);
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close(fd);
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}
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if (perf_evsel__read_on_cpu(evsel, 0, 0) < 0) {
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pr_debug("perf_evsel__open_read_on_cpu\n");
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goto out_close_fd;
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}
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if (evsel->counts->cpu[0].val != nr_open_calls) {
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pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls, got %" PRIu64 "\n",
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nr_open_calls, evsel->counts->cpu[0].val);
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goto out_close_fd;
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}
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err = 0;
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out_close_fd:
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perf_evsel__close_fd(evsel, 1, threads->nr);
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out_evsel_delete:
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perf_evsel__delete(evsel);
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out_thread_map_delete:
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thread_map__delete(threads);
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return err;
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}
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#include <sched.h>
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static int test__open_syscall_event_on_all_cpus(void)
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{
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int err = -1, fd, cpu;
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struct thread_map *threads;
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struct cpu_map *cpus;
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struct perf_evsel *evsel;
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struct perf_event_attr attr;
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unsigned int nr_open_calls = 111, i;
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cpu_set_t cpu_set;
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int id = trace_event__id("sys_enter_open");
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if (id < 0) {
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pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
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return -1;
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}
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threads = thread_map__new(-1, getpid());
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if (threads == NULL) {
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pr_debug("thread_map__new\n");
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return -1;
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}
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cpus = cpu_map__new(NULL);
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if (cpus == NULL) {
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pr_debug("cpu_map__new\n");
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goto out_thread_map_delete;
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}
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CPU_ZERO(&cpu_set);
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memset(&attr, 0, sizeof(attr));
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attr.type = PERF_TYPE_TRACEPOINT;
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attr.config = id;
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evsel = perf_evsel__new(&attr, 0);
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if (evsel == NULL) {
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pr_debug("perf_evsel__new\n");
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goto out_thread_map_delete;
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}
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if (perf_evsel__open(evsel, cpus, threads, false, false) < 0) {
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pr_debug("failed to open counter: %s, "
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"tweak /proc/sys/kernel/perf_event_paranoid?\n",
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strerror(errno));
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goto out_evsel_delete;
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}
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for (cpu = 0; cpu < cpus->nr; ++cpu) {
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unsigned int ncalls = nr_open_calls + cpu;
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/*
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* XXX eventually lift this restriction in a way that
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* keeps perf building on older glibc installations
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* without CPU_ALLOC. 1024 cpus in 2010 still seems
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* a reasonable upper limit tho :-)
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*/
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if (cpus->map[cpu] >= CPU_SETSIZE) {
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pr_debug("Ignoring CPU %d\n", cpus->map[cpu]);
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continue;
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}
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CPU_SET(cpus->map[cpu], &cpu_set);
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if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
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pr_debug("sched_setaffinity() failed on CPU %d: %s ",
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cpus->map[cpu],
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strerror(errno));
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goto out_close_fd;
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}
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for (i = 0; i < ncalls; ++i) {
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fd = open("/etc/passwd", O_RDONLY);
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close(fd);
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}
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CPU_CLR(cpus->map[cpu], &cpu_set);
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}
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/*
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* Here we need to explicitely preallocate the counts, as if
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* we use the auto allocation it will allocate just for 1 cpu,
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* as we start by cpu 0.
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*/
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if (perf_evsel__alloc_counts(evsel, cpus->nr) < 0) {
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pr_debug("perf_evsel__alloc_counts(ncpus=%d)\n", cpus->nr);
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goto out_close_fd;
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}
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err = 0;
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for (cpu = 0; cpu < cpus->nr; ++cpu) {
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unsigned int expected;
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if (cpus->map[cpu] >= CPU_SETSIZE)
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continue;
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if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) {
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pr_debug("perf_evsel__open_read_on_cpu\n");
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err = -1;
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break;
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}
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expected = nr_open_calls + cpu;
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if (evsel->counts->cpu[cpu].val != expected) {
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pr_debug("perf_evsel__read_on_cpu: expected to intercept %d calls on cpu %d, got %" PRIu64 "\n",
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expected, cpus->map[cpu], evsel->counts->cpu[cpu].val);
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err = -1;
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}
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}
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out_close_fd:
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perf_evsel__close_fd(evsel, 1, threads->nr);
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out_evsel_delete:
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perf_evsel__delete(evsel);
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out_thread_map_delete:
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thread_map__delete(threads);
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return err;
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}
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/*
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* This test will generate random numbers of calls to some getpid syscalls,
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* then establish an mmap for a group of events that are created to monitor
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* the syscalls.
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*
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* It will receive the events, using mmap, use its PERF_SAMPLE_ID generated
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* sample.id field to map back to its respective perf_evsel instance.
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*
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* Then it checks if the number of syscalls reported as perf events by
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* the kernel corresponds to the number of syscalls made.
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*/
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static int test__basic_mmap(void)
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{
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int err = -1;
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event_t *event;
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struct thread_map *threads;
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struct perf_session session;
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struct cpu_map *cpus;
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struct perf_evlist *evlist;
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struct perf_event_attr attr = {
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.type = PERF_TYPE_TRACEPOINT,
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.read_format = PERF_FORMAT_ID,
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.sample_type = PERF_SAMPLE_ID,
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.watermark = 0,
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};
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cpu_set_t cpu_set;
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const char *syscall_names[] = { "getsid", "getppid", "getpgrp",
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"getpgid", };
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pid_t (*syscalls[])(void) = { (void *)getsid, getppid, getpgrp,
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(void*)getpgid };
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#define nsyscalls ARRAY_SIZE(syscall_names)
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int ids[nsyscalls];
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unsigned int nr_events[nsyscalls],
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expected_nr_events[nsyscalls], i, j;
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struct perf_evsel *evsels[nsyscalls], *evsel;
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for (i = 0; i < nsyscalls; ++i) {
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char name[64];
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snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
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ids[i] = trace_event__id(name);
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if (ids[i] < 0) {
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pr_debug("Is debugfs mounted on /sys/kernel/debug?\n");
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return -1;
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}
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nr_events[i] = 0;
|
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expected_nr_events[i] = random() % 257;
|
|
}
|
|
|
|
threads = thread_map__new(-1, getpid());
|
|
if (threads == NULL) {
|
|
pr_debug("thread_map__new\n");
|
|
return -1;
|
|
}
|
|
|
|
cpus = cpu_map__new(NULL);
|
|
if (threads == NULL) {
|
|
pr_debug("thread_map__new\n");
|
|
goto out_free_threads;
|
|
}
|
|
|
|
CPU_ZERO(&cpu_set);
|
|
CPU_SET(cpus->map[0], &cpu_set);
|
|
sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
|
|
if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
|
|
pr_debug("sched_setaffinity() failed on CPU %d: %s ",
|
|
cpus->map[0], strerror(errno));
|
|
goto out_free_cpus;
|
|
}
|
|
|
|
evlist = perf_evlist__new();
|
|
if (threads == NULL) {
|
|
pr_debug("perf_evlist__new\n");
|
|
goto out_free_cpus;
|
|
}
|
|
|
|
/* anonymous union fields, can't be initialized above */
|
|
attr.wakeup_events = 1;
|
|
attr.sample_period = 1;
|
|
|
|
/*
|
|
* FIXME: use evsel->attr.sample_type in event__parse_sample.
|
|
* This will nicely remove the requirement that we have
|
|
* all the events with the same sample_type.
|
|
*/
|
|
session.sample_type = attr.sample_type;
|
|
|
|
for (i = 0; i < nsyscalls; ++i) {
|
|
attr.config = ids[i];
|
|
evsels[i] = perf_evsel__new(&attr, i);
|
|
if (evsels[i] == NULL) {
|
|
pr_debug("perf_evsel__new\n");
|
|
goto out_free_evlist;
|
|
}
|
|
|
|
perf_evlist__add(evlist, evsels[i]);
|
|
|
|
if (perf_evsel__open(evsels[i], cpus, threads, false, false) < 0) {
|
|
pr_debug("failed to open counter: %s, "
|
|
"tweak /proc/sys/kernel/perf_event_paranoid?\n",
|
|
strerror(errno));
|
|
goto out_close_fd;
|
|
}
|
|
}
|
|
|
|
if (perf_evlist__mmap(evlist, cpus, threads, 128, true) < 0) {
|
|
pr_debug("failed to mmap events: %d (%s)\n", errno,
|
|
strerror(errno));
|
|
goto out_close_fd;
|
|
}
|
|
|
|
for (i = 0; i < nsyscalls; ++i)
|
|
for (j = 0; j < expected_nr_events[i]; ++j) {
|
|
int foo = syscalls[i]();
|
|
++foo;
|
|
}
|
|
|
|
while ((event = perf_evlist__read_on_cpu(evlist, 0)) != NULL) {
|
|
struct sample_data sample;
|
|
|
|
if (event->header.type != PERF_RECORD_SAMPLE) {
|
|
pr_debug("unexpected %s event\n",
|
|
event__get_event_name(event->header.type));
|
|
goto out_munmap;
|
|
}
|
|
|
|
event__parse_sample(event, &session, &sample);
|
|
evsel = perf_evlist__id2evsel(evlist, sample.id);
|
|
if (evsel == NULL) {
|
|
pr_debug("event with id %" PRIu64
|
|
" doesn't map to an evsel\n", sample.id);
|
|
goto out_munmap;
|
|
}
|
|
nr_events[evsel->idx]++;
|
|
}
|
|
|
|
list_for_each_entry(evsel, &evlist->entries, node) {
|
|
if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) {
|
|
pr_debug("expected %d %s events, got %d\n",
|
|
expected_nr_events[evsel->idx],
|
|
event_name(evsel), nr_events[evsel->idx]);
|
|
goto out_munmap;
|
|
}
|
|
}
|
|
|
|
err = 0;
|
|
out_munmap:
|
|
perf_evlist__munmap(evlist, 1);
|
|
out_close_fd:
|
|
for (i = 0; i < nsyscalls; ++i)
|
|
perf_evsel__close_fd(evsels[i], 1, threads->nr);
|
|
out_free_evlist:
|
|
perf_evlist__delete(evlist);
|
|
out_free_cpus:
|
|
cpu_map__delete(cpus);
|
|
out_free_threads:
|
|
thread_map__delete(threads);
|
|
return err;
|
|
#undef nsyscalls
|
|
}
|
|
|
|
static struct test {
|
|
const char *desc;
|
|
int (*func)(void);
|
|
} tests[] = {
|
|
{
|
|
.desc = "vmlinux symtab matches kallsyms",
|
|
.func = test__vmlinux_matches_kallsyms,
|
|
},
|
|
{
|
|
.desc = "detect open syscall event",
|
|
.func = test__open_syscall_event,
|
|
},
|
|
{
|
|
.desc = "detect open syscall event on all cpus",
|
|
.func = test__open_syscall_event_on_all_cpus,
|
|
},
|
|
{
|
|
.desc = "read samples using the mmap interface",
|
|
.func = test__basic_mmap,
|
|
},
|
|
{
|
|
.func = NULL,
|
|
},
|
|
};
|
|
|
|
static int __cmd_test(void)
|
|
{
|
|
int i = 0;
|
|
|
|
page_size = sysconf(_SC_PAGE_SIZE);
|
|
|
|
while (tests[i].func) {
|
|
int err;
|
|
pr_info("%2d: %s:", i + 1, tests[i].desc);
|
|
pr_debug("\n--- start ---\n");
|
|
err = tests[i].func();
|
|
pr_debug("---- end ----\n%s:", tests[i].desc);
|
|
pr_info(" %s\n", err ? "FAILED!\n" : "Ok");
|
|
++i;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const char * const test_usage[] = {
|
|
"perf test [<options>]",
|
|
NULL,
|
|
};
|
|
|
|
static const struct option test_options[] = {
|
|
OPT_INTEGER('v', "verbose", &verbose,
|
|
"be more verbose (show symbol address, etc)"),
|
|
OPT_END()
|
|
};
|
|
|
|
int cmd_test(int argc, const char **argv, const char *prefix __used)
|
|
{
|
|
argc = parse_options(argc, argv, test_options, test_usage, 0);
|
|
if (argc)
|
|
usage_with_options(test_usage, test_options);
|
|
|
|
symbol_conf.priv_size = sizeof(int);
|
|
symbol_conf.sort_by_name = true;
|
|
symbol_conf.try_vmlinux_path = true;
|
|
|
|
if (symbol__init() < 0)
|
|
return -1;
|
|
|
|
setup_pager();
|
|
|
|
return __cmd_test();
|
|
}
|