Subject: Re: [PATCH] Performance Stats: Kernel patch

From: Andrew Morton <[email-masked]>
Date: Tue, 8 May 2007 12:32:14 -0700

On Tue, 08 May 2007 16:26:51 +0000
Maxim Uvarov <[email-masked]> wrote:

> From: Maxim Uvarov <[email-masked]>
> To: Andrew Morton <[email-masked]>
> Cc: [email-masked]
> Cc: [email-masked]
> Cc: [email-masked]
> Cc: [email-masked]
> Cc: [email-masked]

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?)