lkml.org 
[lkml]   [2015]   [Jan]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: perf_evlist__filter_pollfd() in trace__run()
Arnaldo Carvalho de Melo [acme@kernel.org] wrote:
| Em Thu, Jan 29, 2015 at 03:55:22PM -0800, Sukadev Bhattiprolu escreveu:
| > Should there be another check to before reading the mmap again ?
|
| Possibly, checking, but a similar algorithm should be in place for
| 'record', do you see any problems there? I.e. with 'perf record sleep
| 1'?

No, I don't see the failure with perf record in several hundred attempts.
(both the distro and latest perf-core versions work ok).

|
| - Arnaldo
|
| > I must add that I don't get the SIGSEGV on recent perf-core and the
| > system where we get the crash, first runs into the following
| > errors that we are still looking into (maybe related to "ppc64le"
| > architecture).

With recent perf core I did not get the SIGSEGV (or the syscall translation
failures below) on a different system.

But on this system, a power KVM guest, I get both errors even with latest
perf core (commit c52686f9f88).

| >
| > Problems reading syscall 45 information
| > Problems reading syscall 5 information
| > Problems reading syscall 5 information
| > Problems reading syscall 108 information
| > Problems reading syscall 108 information
| > Problems reading syscall 90 information
| > Problems reading syscall 90 information
| > Problems reading syscall 6 information
| >
| > Unlike the SIGSEGV, these errors occur always.

Most likely this syscall number translation is due to the

https://fedorahosted.org/audit/browser/trunk/lib/machinetab.h

missing this change set 1013, which added support for ppc64le.

Sukadev



\
 
 \ /
  Last update: 2015-01-30 21:41    [W:0.061 / U:4.312 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site