On 06/07/2011 06:02 AM, Srikar Dronamraju wrote:
> Enhances perf probe to user space executables and libraries.
> Provides very basic support for uprobes.
Hi Srikar,
This seems to have an issue with multiple active uprobes, whereas the v3
patchset handled this fine. I haven't tracked down the exact code
difference yet, but here's an example transcript of what I'm seeing:
# perf probe -l
probe_zsh:main (on /bin/zsh:0x000000000000e3f0)
probe_zsh:zalloc (on /bin/zsh:0x0000000000051120)
probe_zsh:zfree (on /bin/zsh:0x0000000000051c70)
# perf stat -e probe_zsh:main zsh -c true
Performance counter stats for 'zsh -c true':
1 probe_zsh:main
0.029387785 seconds time elapsed
# perf stat -e probe_zsh:zalloc zsh -c true
Performance counter stats for 'zsh -c true':
605 probe_zsh:zalloc
0.043836002 seconds time elapsed
# perf stat -e probe_zsh:zfree zsh -c true
Performance counter stats for 'zsh -c true':
36 probe_zsh:zfree
0.029445890 seconds time elapsed
# perf stat -e probe_zsh:* zsh -c true
Performance counter stats for 'zsh -c true':
0 probe_zsh:zalloc
1 probe_zsh:main
0 probe_zsh:zfree
0.030912587 seconds time elapsed
# perf stat -e probe_zsh:z* zsh -c true
Performance counter stats for 'zsh -c true':
605 probe_zsh:zalloc
0 probe_zsh:zfree
0.043774671 seconds time elapsed
It seems like among the selected probes, only one with the lowest offset
ever gets hit. Any ideas?
Thanks,
Josh
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxxx For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>