linux-kernel - Re: Regression from 2.6.36

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Message-Id: <20110414110816.EA841944@pobox.sk>
Date:	Thu, 14 Apr 2011 11:08:16 +0200
From:	"azurIt" <azurit@...ox.sk>
To:	"Eric Dumazet" <eric.dumazet@...il.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"Changli Gao" <xiaosuo@...il.com>,
	"Américo Wang" <xiyou.wangcong@...il.com>,
	"Jiri Slaby" <jslaby@...e.cz>, <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>, <linux-fsdevel@...r.kernel.org>,
	"Jiri Slaby" <jirislaby@...il.com>, "Mel Gorman" <mel@....ul.ie>
Subject: Re: Regression from 2.6.36


Here it is:


# ls /proc/31416/fd | wc -l
5926


azur


______________________________________________________________
> Od: "Eric Dumazet" <eric.dumazet@...il.com>
> Komu: Andrew Morton <akpm@...ux-foundation.org>
> Dátum: 14.04.2011 08:32
> Predmet: Re: Regression from 2.6.36
>
> CC: "Changli Gao" <xiaosuo@...il.com>, "Américo Wang" <xiyou.wangcong@...il.com>, "Jiri Slaby" <jslaby@...e.cz>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, linux-fsdevel@...r.kernel.org, "Jiri Slaby" <jirislaby@...il.com>, "Mel Gorman" <mel@....ul.ie>
>Le mercredi 13 avril 2011 à 22:28 -0700, Andrew Morton a écrit :
>> On Thu, 14 Apr 2011 04:10:58 +0200 Eric Dumazet <eric.dumazet@...il.com> wrote:
>> 
>> > > --- a/fs/file.c~a
>> > > +++ a/fs/file.c
>> > > @@ -39,14 +39,17 @@ int sysctl_nr_open_max = 1024 * 1024; /*
>> > >   */
>> > >  static DEFINE_PER_CPU(struct fdtable_defer, fdtable_defer_list);
>> > >  
>> > > -static inline void *alloc_fdmem(unsigned int size)
>> > > +static void *alloc_fdmem(unsigned int size)
>> > >  {
>> > > -	void *data;
>> > > -
>> > > -	data = kmalloc(size, GFP_KERNEL|__GFP_NOWARN);
>> > > -	if (data != NULL)
>> > > -		return data;
>> > > -
>> > > +	/*
>> > > +	 * Very large allocations can stress page reclaim, so fall back to
>> > > +	 * vmalloc() if the allocation size will be considered "large" by the VM.
>> > > +	 */
>> > > +	if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER) {
>> > > +		void *data = kmalloc(size, GFP_KERNEL|__GFP_NOWARN);
>> > > +		if (data != NULL)
>> > > +			return data;
>> > > +	}
>> > >  	return vmalloc(size);
>> > >  }
>> > >  
>> > > _
>> > > 
>> > 
>> > Acked-by: Eric Dumazet <eric.dumazet@...il.com>
>> > 
>> > #define PAGE_ALLOC_COSTLY_ORDER 3
>> > 
>> > On x86_64, this means we try kmalloc() up to 4096 files in fdtable.
>> 
>> Thanks.  I added the cc:stable to the changelog.
>> 
>> It'd be nice to get this tested if poss, to confrm that it actually
>> fixes things.
>> 
>> Also, Melpoke.
>
>Azurit, could you check how many fds are opened by your apache servers ?
>(must be related to number of virtual hosts / acces_log / error_log
>files)
>
>Pick one pid from ps list
>ps aux | grep apache
>
>ls /proc/{pid_of_one_apache}/fd | wc -l
>
>or
>
>lsof -p { pid_of_one_apache} | tail -n 2
>apache2 8501 httpadm   13w   REG     104,7  2350407   3866638 /data/logs/httpd/rewrites.log
>apache2 8501 httpadm   14r  0000      0,10        0 263148343 eventpoll
>
>Here it's "14"
>
>Thanks
>
>
>
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