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* [PATCH][RFC] oprofile 2.5.38 patch
@ 2002-09-23 22:29 John Levon
  2002-09-24 18:48 ` Christoph Hellwig
  2002-09-26 16:08 ` Alan Cox
  0 siblings, 2 replies; 6+ messages in thread
From: John Levon @ 2002-09-23 22:29 UTC (permalink / raw)
  To: linux-kernel; +Cc: bobm, phil.el, torvalds

At :

You can find a very early patch against 2.5.38 (87k) and userspace
tools for the new oprofile stuff. I've split it up into smaller chunks
at (only for easier

I would appreciate people's comments. I'm not exactly happy with
buffer_sync.c in particular, so I'd love to find a better way.

The code has been lightly tested on a 2-way PII-400 box, which showed
some quirks, but it seems to work.

Note that you must use the new userspace tools at the URL (and they will
conflict with any existing oprofile stuff, so please don't mix the two).

A short summary of how it works (mostly thought out by Linus ;) :

Each cpu has a linear buffer for capturing EIP/event values. Events such
as munmaps trigger a buffer sync, where the EIP values are converted
into cookie/offset pairs and stored in the global buffer. The cookies
are accessible by the userspace daemon which uses the binary path to
create the sample files. Context switches also need to go in the cpu
buffer. release_task() needs similar tracking in order to prevent
task_struct * accesses after it has been freed.


^ permalink raw reply	[flat|nested] 6+ messages in thread
[parent not found: <>]

end of thread, other threads:[~2002-09-26 16:00 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2002-09-23 22:29 [PATCH][RFC] oprofile 2.5.38 patch John Levon
2002-09-24 18:48 ` Christoph Hellwig
2002-09-24 12:23   ` John Levon
2002-09-26 16:08 ` Alan Cox
     [not found] <>
2002-09-24 12:43 ` Andi Kleen
2002-09-24 12:55   ` John Levon

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