lkml.org 
[lkml]   [2008]   [Nov]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [patch 05/24] perfmon: X86 generic code (x86)
From
From: "stephane eranian" <eranian@googlemail.com>
Date: Thu, 27 Nov 2008 12:35:54 +0100

> I am still wondering how Oprofile handles the case where multiple
> processes or threads access the same file descriptor.

There's only one profiling buffer active on a given cpu,
so it's pure per-cpu value insertion.

In any event I think that NMI profiling is a must, especially
for the kernel. You get total unusable crap otherwise. I
just learned this the hard way having gotten an NMI'ish scheme
working on sparc64 just the other day.


\
 
 \ /
  Last update: 2008-11-27 12:45    [W:3.270 / U:0.016 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site