linux-kernel - Re: Regression from 2.6.36

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Message-Id: <20110419212920.AFE7DD8D@pobox.sk>
Date:	Tue, 19 Apr 2011 21:29:20 +0200
From:	"azurIt" <azurit@...ox.sk>
To:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Eric Dumazet" <eric.dumazet@...il.com>,
	"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


Andrew,

which kernel versions will include this patch ? Thank you.

azur



______________________________________________________________
> Od: "Andrew Morton" <akpm@...ux-foundation.org>
> Komu: Eric Dumazet <eric.dumazet@...il.com>,Changli Gao <xiaosuo@...il.com>,Américo Wang <xiyou.wangcong@...il.com>,Jiri Slaby <jslaby@...e.cz>, azurIt <azurit@...ox.sk>,linux-kernel@...r.kernel.org, linux-mm@...ck.org,linux-fsdevel@...r.kernel.org, Jiri Slaby <jirislaby@...il.com>,Mel Gorman <mel@....ul.ie>
> Dátum: 13.04.2011 23:26
> Predmet: Re: Regression from 2.6.36
>
>On Wed, 13 Apr 2011 14:16:00 -0700
>Andrew Morton <akpm@...ux-foundation.org> wrote:
>
>>  fs/file.c |   17 ++++++++++-------
>>  1 file changed, 10 insertions(+), 7 deletions(-)
>
>bah, stupid compiler.
>
>
>--- a/fs/file.c~vfs-avoid-large-kmallocs-for-the-fdtable
>+++ a/fs/file.c
>@@ -9,6 +9,7 @@
> #include <linux/module.h>
> #include <linux/fs.h>
> #include <linux/mm.h>
>+#include <linux/mmzone.h>
> #include <linux/time.h>
> #include <linux/sched.h>
> #include <linux/slab.h>
>@@ -39,14 +40,17 @@ 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);
> }
> 
>_
>
>--
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