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Improve stability of find_vma BPF test

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Remove unneeded spleep and increase length of dummy CPU
intensive computation to guarantee test process execution.
Also, complete aforemention computation as soon as
test success criteria is met

Signed-off-by: Mykola Lysenko <mykolal@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20220308200449.1757478-4-mykolal@fb.com
This commit is contained in:
Mykola Lysenko 2022-03-08 12:04:49 -08:00 committed by Andrii Nakryiko
parent 1fd4986412
commit ba83af0591
1 changed files with 19 additions and 9 deletions
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20
tools/testing/selftests/bpf/prog_tests/find_vma.c
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@ -7,12 +7,14 @@
#include "find_vma_fail1.skel.h"
#include "find_vma_fail2.skel.h"
static void test_and_reset_skel(struct find_vma *skel, int expected_find_zero_ret)
static void test_and_reset_skel(struct find_vma *skel, int expected_find_zero_ret, bool need_test)
{
if (need_test) {
ASSERT_EQ(skel->bss->found_vm_exec, 1, "found_vm_exec");
ASSERT_EQ(skel->data->find_addr_ret, 0, "find_addr_ret");
ASSERT_EQ(skel->data->find_zero_ret, expected_find_zero_ret, "find_zero_ret");
ASSERT_OK_PTR(strstr(skel->bss->d_iname, "test_progs"), "find_test_progs");
}
skel->bss->found_vm_exec = 0;
skel->data->find_addr_ret = -1;
@ -36,11 +38,20 @@ static int open_pe(void)
return pfd >= 0 ? pfd : -errno;
}
static bool find_vma_pe_condition(struct find_vma *skel)
{
return skel->bss->found_vm_exec == 0 ||
skel->data->find_addr_ret != 0 ||
skel->data->find_zero_ret == -1 ||
strcmp(skel->bss->d_iname, "test_progs") != 0;
}
static void test_find_vma_pe(struct find_vma *skel)
{
struct bpf_link *link = NULL;
volatile int j = 0;
int pfd, i;
const int one_bn = 1000000000;
pfd = open_pe();
if (pfd < 0) {
@ -57,10 +68,10 @@ static void test_find_vma_pe(struct find_vma *skel)
if (!ASSERT_OK_PTR(link, "attach_perf_event"))
goto cleanup;
for (i = 0; i < 1000000; ++i)
for (i = 0; i < one_bn && find_vma_pe_condition(skel); ++i)
++j;
test_and_reset_skel(skel, -EBUSY /* in nmi, irq_work is busy */);
test_and_reset_skel(skel, -EBUSY /* in nmi, irq_work is busy */, i == one_bn);
cleanup:
bpf_link__destroy(link);
close(pfd);
@ -75,7 +86,7 @@ static void test_find_vma_kprobe(struct find_vma *skel)
return;
getpgid(skel->bss->target_pid);
test_and_reset_skel(skel, -ENOENT /* could not find vma for ptr 0 */);
test_and_reset_skel(skel, -ENOENT /* could not find vma for ptr 0 */, true);
}
static void test_illegal_write_vma(void)
@ -108,7 +119,6 @@ void serial_test_find_vma(void)
skel->bss->addr = (__u64)(uintptr_t)test_find_vma_pe;
test_find_vma_pe(skel);
usleep(100000); /* allow the irq_work to finish */
test_find_vma_kprobe(skel);
find_vma__destroy(skel);