linux-kernel - Re: [PATCH] mm/vmscan: Do not block forever at shrink_inactive

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Message-Id: <201405200354.s4K3sTUx057458@www262.sakura.ne.jp>
Date:	Tue, 20 May 2014 12:54:29 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	Dave Chinner <david@...morbit.com>
Cc:	riel@...hat.com, kosaki.motohiro@...fujitsu.com,
	fengguang.wu@...el.com, kamezawa.hiroyu@...fujitsu.com,
	linux-kernel@...r.kernel.org, xfs@....sgi.com
Subject: Re: [PATCH] mm/vmscan: Do not block forever at shrink_inactive_list().

Dave Chinner wrote:
> So, XFS should be passing kswapd context to the workqueue allocation
> context. The patch below does this.
> 
> Tetsuo-san, when it comes to problems involving XFS, you should
> really CC xfs@....sgi.com because very few people really know how
> XFS works and even fewer still know how it is supposed to interact
> with memory reclaim....

Thank you for the patch, but ...

  #define PF_KSWAPD       0x00040000      /* I am kswapd */

  static inline int current_is_kswapd(void)
  {
  	return current->flags & PF_KSWAPD;
  }

I think ((char) (current->flags & 0x00040000)) == 0.
Your patch wants

  -args->kswapd = current_is_kswapd();
  +args->kswapd = (current_is_kswapd() != 0);
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