lkml.org 
[lkml]   [2011]   [Mar]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] POWER: perf_event: Skip updating kernel counters if register value shrinks
From
Date
On Tue, 2011-03-29 at 10:25 -0400, Eric B Munson wrote:
> Here I made the assumption that the hardware would never remove more events in
> a speculative roll back than it had added. This is not a situation I
> encoutered in my limited testing, so I didn't think underflow was possible. I
> will send out a V2 using the signed 32 bit delta and remeber to CC stable
> this time.

I'm not thinking about underflow but rollover... or that isn't possible
with those counters ? IE. They don't wrap back to 0 after hitting
ffffffff ?

Cheers,
Ben.




\
 
 \ /
  Last update: 2011-03-29 23:15    [W:0.064 / U:0.056 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site