linux-kernel - [PATCH 0/5] Some vmevent fixes...

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Date:	Fri, 1 Jun 2012 05:21:18 -0700
From:	Anton Vorontsov <cbouatmailru@...il.com>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Minchan Kim <minchan@...nel.org>,
	Leonid Moiseichuk <leonid.moiseichuk@...ia.com>,
	John Stultz <john.stultz@...aro.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	patches@...aro.org, kernel-team@...roid.com
Subject: [PATCH 0/5] Some vmevent fixes...

On Tue, May 08, 2012 at 10:36:31AM +0300, Pekka Enberg wrote:
[...]
> > 2) VMEVENT_ATTR_STATE_ONE_SHOT is misleading name. That is effect as
> > edge trigger shot. not only once.
> 
> Would VMEVENT_ATTR_STATE_EDGE_TRIGGER be a better name?
[...] 
> > 4) Currently, vmstat have per-cpu batch and vmstat updating makes 3
> > second delay at maximum.
> >  This is fine for usual case because almost userland watcher only
> > read /proc/vmstat per second.
> >  But, for vmevent_fd() case, 3 seconds may be unacceptable delay. At
> > worst, 128 batch x 4096
> >  x 4k pagesize = 2G bytes inaccurate is there.
> 
> That's pretty awful. Anton, Leonid, comments?
[...]
> > 5) __VMEVENT_ATTR_STATE_VALUE_WAS_LT should be removed from userland
> > exporting files.
> >  When exporing kenrel internal, always silly gus used them and made unhappy.
> 
> Agreed. Anton, care to cook up a patch to do that?

KOSAKI-San, Pekka,

Much thanks for your reviews!

These three issues should be fixed by the following patches. One mm/
change is needed outside of vmevent...

And I'm looking into other issues you pointed out...

Thanks!

---
 include/linux/vmevent.h |   10 +++----
 include/linux/vmstat.h  |    2 ++
 mm/vmevent.c            |   66 +++++++++++++++++++++++++++++------------------
 mm/vmstat.c             |   22 +++++++++++++++-
 4 files changed, 68 insertions(+), 32 deletions(-)

-- 
Anton Vorontsov
Email: cbouatmailru@...il.com
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