Hi Maintainers,
We are profiling VPP with MAP (a software profile suite on Arm CPUs, see
details in
https://www.arm.com/products/development-tools/server-and-hpc/forge/map) on Arm
CPUs.
The MAP sampler runs inside target process as a library because it does a lot
more things that require access to the program's memory like matching up OpenMP
threads etc. So it is a lot more invasive and uses the SIGPROF signal to
control the sample rate.
VPP will receive SIGPROF signal because MAP uses SIGPROF signal to drive its
sampler to do profiling on VPP. However, the default action of SIGPROF signal
handler in VPP such as unix_signal_handler() is process termination. To profile
VPP with MAP, We need to change VPP signal handler to ignore SIGPROF signal.
Can we upstream a patch to simply ignore the SIGPROF in VPP?
diff --git a/src/vlib/unix/main.c b/src/vlib/unix/main.c
index e40a462..6138a6f 100755
--- a/src/vlib/unix/main.c
+++ b/src/vlib/unix/main.c
@@ -218,6 +218,7 @@
/* ignore SIGPIPE, SIGCHLD */
case SIGPIPE:
case SIGCHLD:
+ case SIGPROF:
sa.sa_sigaction = (void *) SIG_IGN;
break;
Thanks.
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