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trace: do not shm_unlink if tracepoints were specified

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This allows us to use the tracepoints as forensics when
a crash occurs - basically a high-powered trace buffer.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I27f6c7a196501b4100cfc19c0354f2c6095ff3bb

Reviewed-on: https://review.gerrithub.io/424282
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
This commit is contained in:
Jim Harris 2018-08-31 15:16:39 -07:00 committed by Ben Walker
parent aa37b4f9d5
commit 8b6826536c
1 changed files with 18 additions and 5 deletions
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23
lib/trace/trace.c
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@ -128,10 +128,23 @@ trace_init_err:
void
spdk_trace_cleanup(void)
{
if (g_trace_histories) {
munmap(g_trace_histories, sizeof(struct spdk_trace_histories));
g_trace_histories = NULL;
close(g_trace_fd);
bool unlink;
if (g_trace_histories == NULL) {
return;
}
/*
* Only unlink the shm if there were no tracepoints enabled. This ensures the file
* can be used after this process exits/crashes for debugging.
* Note that we have to calculate this value before g_trace_histories gets unmapped.
*/
unlink = spdk_mem_all_zero(g_trace_flags->tpoint_mask, sizeof(g_trace_flags->tpoint_mask));
munmap(g_trace_histories, sizeof(struct spdk_trace_histories));
g_trace_histories = NULL;
close(g_trace_fd);
if (unlink) {
shm_unlink(g_shm_name);
}
shm_unlink(g_shm_name);
}