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user_exit_info: Print out debug dump if available

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Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2024-01-25 08:49:16 -10:00
parent 09e2824b57
commit 740e382f12
1 changed files with 8 additions and 0 deletions
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8
scheds/include/scx/user_exit_info.h
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@ -14,6 +14,7 @@ struct user_exit_info {
int kind;
char reason[128];
char msg[1024];
char dump[32768];
};
#ifdef __bpf__
@ -26,6 +27,7 @@ static inline void uei_record(struct user_exit_info *uei,
{
bpf_probe_read_kernel_str(uei->reason, sizeof(uei->reason), ei->reason);
bpf_probe_read_kernel_str(uei->msg, sizeof(uei->msg), ei->msg);
bpf_probe_read_kernel_str(uei->dump, sizeof(uei->dump), ei->dump);
/* use __sync to force memory barrier */
__sync_val_compare_and_swap(&uei->kind, uei->kind, ei->kind);
}
@ -40,6 +42,12 @@ static inline bool uei_exited(struct user_exit_info *uei)
static inline void uei_print(const struct user_exit_info *uei)
{
if (uei->dump[0] != '\0') {
fputs("\nDEBUG DUMP\n", stderr);
fputs("================================================================================\n\n", stderr);
fputs(uei->dump, stderr);
fputs("\n================================================================================\n\n", stderr);
}
fprintf(stderr, "EXIT: %s", uei->reason);
if (uei->msg[0] != '\0')
fprintf(stderr, " (%s)", uei->msg);