linux-kernel - Re: [PATCH] mm: sl[auo]b: Use atomic bit operations to update page-flags.

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Message-ID: <1336504276.3752.2600.camel@edumazet-glaptop>
Date:	Tue, 08 May 2012 21:11:16 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Pravin B Shelar <pshelar@...ira.com>
Cc:	cl@...ux.com, penberg@...nel.org, mpm@...enic.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, jesse@...ira.com,
	abhide@...ira.com
Subject: Re: [PATCH] mm: sl[auo]b: Use atomic bit operations to update
 page-flags.

On Tue, 2012-05-08 at 11:55 -0700, Pravin B Shelar wrote:
> Transparent huge pages can change page->flags (PG_compound_lock)
> without taking Slab lock. So sl[auo]b need to use atomic bit
> operation while changing page->flags.
> Specificly this patch fixes race between compound_unlock and slab
> functions which does page-flags update. This can occur when
> get_page/put_page is called on page from slab object.


But should get_page()/put_page() be called on a page own by slub ?


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