linux-kernel - Re: 2.6.22-stable causes oomkiller to be invoked

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Message-ID: <20071221044508.GA11996@linux.vnet.ibm.com>
Date:	Fri, 21 Dec 2007 10:15:08 +0530
From:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
To:	Christoph Lameter <clameter@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, htejun@...il.com,
	gregkh@...e.de, Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ibm.com>, maneesh@...ux.vnet.ibm.com,
	lkml <linux-kernel@...r.kernel.org>, stable@...nel.org,
	linux-mm@...ck.org
Subject: Re: 2.6.22-stable causes oomkiller to be invoked

> > It was just
> > 
> > 	while echo ; do cat /sys/kernel/<some file> ; done
> > 
> > it's all in the email threads somewhere..
> 
> The patch that was posted in the thread that I mentioned earlier is here. 
> I ran the test for 15 minutes and things are still fine.
> 
> 
> 
> quicklist: Set tlb->need_flush if pages are remaining in quicklist 0
> 
> This ensures that the quicklists are drained. Otherwise draining may only 
> occur when the processor reaches an idle state.
> 

Hi Christoph,

No, it does not stop the oom I am seeing here.

Thanks,

> Signed-off-by: Christoph Lameter <clameter@....com>
> 
> Index: linux-2.6/include/asm-generic/tlb.h
> ===================================================================
> --- linux-2.6.orig/include/asm-generic/tlb.h	2007-12-13 14:45:38.000000000 -0800
> +++ linux-2.6/include/asm-generic/tlb.h	2007-12-13 14:51:07.000000000 -0800
> @@ -14,6 +14,7 @@
>  #define _ASM_GENERIC__TLB_H
> 
>  #include <linux/swap.h>
> +#include <linux/quicklist.h>
>  #include <asm/pgalloc.h>
>  #include <asm/tlbflush.h>
> 
> @@ -85,6 +86,9 @@ tlb_flush_mmu(struct mmu_gather *tlb, un
>  static inline void
>  tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
>  {
> +#ifdef CONFIG_QUICKLIST
> +	tlb->need_flush += &__get_cpu_var(quicklist)[0].nr_pages != 0;
> +#endif
>  	tlb_flush_mmu(tlb, start, end);
> 
>  	/* keep the page table cache within bounds */

-- 
regards,
Dhaval
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