67fd189246
Currently it doesn't handle tasks in chroot properly. As filenames in
MMAP records base on their root directory, it's different than what perf
tool can see from outside.
Add filename_with_chroot() helper to deal with those cases. The
function returns a new filename only if it's in a different root
directory. Since it needs to access /proc for the process, it only
works until the task exits.
With this change, I can see symbols in my program like below.
# perf record -o- chroot myroot myprog 3 | perf report -i-
...
#
# Overhead Command Shared Object Symbol
# ........ ....... ................. .............................
#
99.83% myprog myprog [.] loop
0.04% chroot [kernel.kallsyms] [k] fxregs_fixup
0.04% chroot [kernel.kallsyms] [k] rsm_load_seg_32
...
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20220202070828.143303-3-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef GIT_COMPAT_UTIL_H
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#define GIT_COMPAT_UTIL_H
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#define _BSD_SOURCE 1
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/* glibc 2.20 deprecates _BSD_SOURCE in favour of _DEFAULT_SOURCE */
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#define _DEFAULT_SOURCE 1
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <linux/compiler.h>
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#include <sys/types.h>
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#ifndef __cplusplus
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#include <internal/cpumap.h>
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#endif
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/* General helper functions */
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void usage(const char *err) __noreturn;
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void die(const char *err, ...) __noreturn __printf(1, 2);
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struct dirent;
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struct strlist;
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int mkdir_p(char *path, mode_t mode);
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int rm_rf(const char *path);
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int rm_rf_perf_data(const char *path);
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struct strlist *lsdir(const char *name, bool (*filter)(const char *, struct dirent *));
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bool lsdir_no_dot_filter(const char *name, struct dirent *d);
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size_t hex_width(u64 v);
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int sysctl__max_stack(void);
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bool sysctl__nmi_watchdog_enabled(void);
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int fetch_kernel_version(unsigned int *puint,
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char *str, size_t str_sz);
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#define KVER_VERSION(x) (((x) >> 16) & 0xff)
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#define KVER_PATCHLEVEL(x) (((x) >> 8) & 0xff)
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#define KVER_SUBLEVEL(x) ((x) & 0xff)
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#define KVER_FMT "%d.%d.%d"
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#define KVER_PARAM(x) KVER_VERSION(x), KVER_PATCHLEVEL(x), KVER_SUBLEVEL(x)
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int perf_tip(char **strp, const char *dirpath);
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#ifndef HAVE_SCHED_GETCPU_SUPPORT
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int sched_getcpu(void);
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#endif
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extern bool perf_singlethreaded;
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void perf_set_singlethreaded(void);
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void perf_set_multithreaded(void);
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char *perf_exe(char *buf, int len);
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#ifndef O_CLOEXEC
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#ifdef __sparc__
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#define O_CLOEXEC 0x400000
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#elif defined(__alpha__) || defined(__hppa__)
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#define O_CLOEXEC 010000000
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#else
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#define O_CLOEXEC 02000000
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#endif
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#endif
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extern bool test_attr__enabled;
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void test_attr__ready(void);
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void test_attr__init(void);
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struct perf_event_attr;
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void test_attr__open(struct perf_event_attr *attr, pid_t pid, struct perf_cpu cpu,
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int fd, int group_fd, unsigned long flags);
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struct perf_debuginfod {
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const char *urls;
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bool set;
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};
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void perf_debuginfod_setup(struct perf_debuginfod *di);
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char *filename_with_chroot(int pid, const char *filename);
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#endif /* GIT_COMPAT_UTIL_H */
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