linux-kernel - Re: [PATCH] Show kernel stack usage to /proc/meminfo and OOM log

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Message-Id: <20090701082531.85C2.A69D9226@jp.fujitsu.com>
Date:	Wed,  1 Jul 2009 08:26:37 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	Minchan Kim <minchan.kim@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	David Howells <dhowells@...hat.com>,
	"riel@...hat.com" <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"tytso@....edu" <tytso@....edu>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"elladan@...imo.com" <elladan@...imo.com>,
	"npiggin@...e.de" <npiggin@...e.de>,
	"Barnes, Jesse" <jesse.barnes@...el.com>
Subject: Re: [PATCH] Show kernel stack usage to /proc/meminfo and OOM log

> On Tue, 30 Jun 2009, KOSAKI Motohiro wrote:
> 
> > +static void account_kernel_stack(struct thread_info *ti, int on)
> 
> static inline?

gcc automatically inlined, IMHO.

> > +{
> > +	struct zone* zone = page_zone(virt_to_page(ti));
> > +	int sign = on ? 1 : -1;
> > +	long acct = sign * (THREAD_SIZE / PAGE_SIZE);
> 
> int pages = THREAD_SIZE / PAGE_SIZE;
> 
> ?

Will fix. thanks cleaner code advise.

> 
> > +
> > +	mod_zone_page_state(zone, NR_KERNEL_STACK, acct);
> 
> mod_zone_page_state(zone, NR_KERNEL_STACK, on ? pages : -pages);

yes, will fix.



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