linux-kernel - Re: [Patch] x86,mm: check freeze request in page fault handler

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Message-ID: <20140813093613.GB2775@dhcp22.suse.cz>
Date:	Wed, 13 Aug 2014 11:36:13 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Patch] x86,mm: check freeze request in page fault handler

On Tue 12-08-14 17:47:02, Cong Wang wrote:
[...]
> Does the following updated patch make any sense to you? If not, I will just
> drop it.

Not really to be honest. I do not see what problem you are trying to fix.

> diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
> index a241946..8c0a7d8 100644
> --- a/arch/x86/mm/fault.c
> +++ b/arch/x86/mm/fault.c
> @@ -14,6 +14,7 @@
>  #include <linux/hugetlb.h>             /* hstate_index_to_shift        */
>  #include <linux/prefetch.h>            /* prefetchw                    */
>  #include <linux/context_tracking.h>    /* exception_enter(), ...       */
> +#include <linux/freezer.h>             /* try_to_freeze()              */
> 
>  #include <asm/traps.h>                 /* dotraplinkage, ...           */
>  #include <asm/pgalloc.h>               /* pgd_*(), ...                 */
> @@ -904,6 +905,9 @@ mm_fault_error(struct pt_regs *regs, unsigned long
> error_code,
>                  * oom-killed):
>                  */
>                 pagefault_out_of_memory();
> +
> +               if (signal_pending(current))
> +                       try_to_freeze();
>         } else {
>                 if (fault & (VM_FAULT_SIGBUS|VM_FAULT_HWPOISON|
>                              VM_FAULT_HWPOISON_LARGE))

-- 
Michal Hocko
SUSE Labs
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