[PATCH] Performance Stats: Kernel patch

[Andrew Morton]

On Tue, 08 May 2007 16:26:51 +0000
Maxim Uvarov <muvarov at ru.mvista.com> wrote:

> From: Maxim Uvarov <muvarov at ru.mvista.com>
> To: Andrew Morton <akpm at linux-foundation.org>
> Cc: pavel at ucw.cz
> Cc: linuxppc-dev at ozlabs.org
> Cc: wli at holomorphy.com
> Cc: dada1 at cosmosbay.com
> Cc: pavel at ucw.cz

Strange that linux-ppc was the only mailing list you copied?

> Subject: [PATCH] Performance Stats: Kernel patch
> Date: Tue, 08 May 2007 16:26:51 +0000
> User-Agent: StGIT/0.12.1
> 
> 
> Patch makes available to the user the following
> task and process performance statistics:
> 	* Involuntary Context Switches (task_struct->nivcsw)
> 	* Voluntary Context Switches (task_struct->nvcsw)
> 	* Number of system calls (added new counter
> 	  thread_info->sysall_count)
> 	           
> Statistics information is available from:
>         1. taskstats interface (Documentation/accounting/)
> 	2. /proc/PID/status (task only).
> 
> This data is useful for detecting hyperactivity
> patterns between processes.

syscall entry is a super-hotpath and there will be a developer revolt
if we go adding an incl to that path, sorry.

(Did that incl also cover the int 80 entry?)