* [RFC] perf top and deleted binaries
@ 2011-05-09 18:28 Arun Sharma
2011-05-09 20:58 ` Arnaldo Carvalho de Melo
0 siblings, 1 reply; 2+ messages in thread
From: Arun Sharma @ 2011-05-09 18:28 UTC (permalink / raw)
To: linux-perf-users, acme
For long running binaries which may have been replaced or deleted, today
perf top spits out a warning and doesn't show anything. For eg:
test.c:
main()
{
while(1);
}
gcc -O2 test.c -o test
./test &
gcc -O2 test.c -o test # overwrite the binary
perf top -p <pid>
shows nothing. It could instead show:
100% <unresolved> test
like perf record/report would show for the same test case. Comments?
-Arun
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [RFC] perf top and deleted binaries
2011-05-09 18:28 [RFC] perf top and deleted binaries Arun Sharma
@ 2011-05-09 20:58 ` Arnaldo Carvalho de Melo
0 siblings, 0 replies; 2+ messages in thread
From: Arnaldo Carvalho de Melo @ 2011-05-09 20:58 UTC (permalink / raw)
To: Arun Sharma; +Cc: linux-perf-users
Em Mon, May 09, 2011 at 11:28:23AM -0700, Arun Sharma escreveu:
>
> For long running binaries which may have been replaced or deleted, today
> perf top spits out a warning and doesn't show anything. For eg:
>
> test.c:
>
> main()
> {
> while(1);
> }
>
> gcc -O2 test.c -o test
> ./test &
> gcc -O2 test.c -o test # overwrite the binary
> perf top -p <pid>
>
> shows nothing. It could instead show:
>
> 100% <unresolved> test
>
> like perf record/report would show for the same test case. Comments?
Agreed :-)
When/if we get build-id as first class citizen, stashing it in some
kernel data structure at DSO load time, we'll be able to use it for
content based DSO lookup in the cache.
- Arnaldo
^ permalink raw reply [flat|nested] 2+ messages in thread
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2011-05-09 18:28 [RFC] perf top and deleted binaries Arun Sharma
2011-05-09 20:58 ` Arnaldo Carvalho de Melo
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