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MINOR: debug: copy the thread info into the post_mortem struct

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The last starting thread now copies the pthread ID and stack top of
each thread into post_mortem. That way it's as easy as issuing
"p post_mortem" in gdb to see all thread IDs and stack frames and more
easily map them to the threads met in a core.
This commit is contained in:
Willy Tarreau 2023-11-22 18:30:19 +01:00
parent c0eec3a4aa
commit 37e3dd718c
1 changed files with 29 additions and 0 deletions
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29
src/debug.c
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@ -98,6 +98,13 @@ struct post_mortem {
gid_t boot_gid;
struct rlimit limit_fd; // RLIMIT_NOFILE
struct rlimit limit_ram; // RLIMIT_AS or RLIMIT_DATA
#if defined(USE_THREAD)
struct {
ullong pth_id; // pthread_t cast to a ullong
void *stack_top; // top of the stack
} thread_info[MAX_THREADS];
#endif
} process;
} post_mortem ALIGNED(256) = { };
@ -2145,6 +2152,28 @@ static int feed_post_mortem()
REGISTER_POST_CHECK(feed_post_mortem);
#ifdef USE_THREAD
/* init code is called one at a time so let's collect all per-thread info on
* the last starting thread. These info are not critical anyway and there's no
* problem if we get them slightly late.
*/
static int feed_post_mortem_late()
{
static int per_thread_info_collected;
if (HA_ATOMIC_ADD_FETCH(&per_thread_info_collected, 1) == global.nbthread) {
int i;
for (i = 0; i < global.nbthread; i++) {
post_mortem.process.thread_info[i].pth_id = ha_thread_info[i].pth_id;
post_mortem.process.thread_info[i].stack_top = ha_thread_info[i].stack_top;
}
}
return 1;
}
REGISTER_PER_THREAD_INIT(feed_post_mortem_late);
#endif
/* register cli keywords */
static struct cli_kw_list cli_kws = {{ },{
{{ "debug", "dev", "bug", NULL }, "debug dev bug : call BUG_ON() and crash", debug_parse_cli_bug, NULL, NULL, NULL, ACCESS_EXPERT },