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From: Matthew Wilcox <willy@infradead.org>
To: Qian Cai <cai@lca.pw>
Cc: Huang Ying <ying.huang@intel.com>,
	linux-mm@kvack.org, "Kirill A. Shutemov" <kirill@shutemov.name>
Subject: Re: page cache: Store only head pages in i_pages
Date: Sat, 30 Mar 2019 07:10:52 -0700
Message-ID: <20190330141052.GZ10344@bombadil.infradead.org> (raw)
In-Reply-To: <20190330030431.GX10344@bombadil.infradead.org>

On Fri, Mar 29, 2019 at 08:04:32PM -0700, Matthew Wilcox wrote:
> Excellent!  I'm not comfortable with the rule that you have to be holding
> the i_pages lock in order to call find_get_page() on a swap address_space.
> How does this look to the various smart people who know far more about the
> MM than I do?
> 
> The idea is to ensure that if this race does happen, the page will be
> handled the same way as a pagecache page.  If __delete_from_swap_cache()
> can be called while the page is still part of a VMA, then this patch
> will break page_to_pgoff().  But I don't think that can happen ... ?

Oh, blah, that can totally happen.  reuse_swap_page() calls
delete_from_swap_cache().  Need a new plan.


  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1553285568.26196.24.camel@lca.pw>
2019-03-23  3:38 ` Matthew Wilcox
2019-03-23 23:50   ` Qian Cai
2019-03-24  2:06     ` Matthew Wilcox
2019-03-24  2:52       ` Qian Cai
2019-03-24  3:04         ` Matthew Wilcox
2019-03-24 15:42           ` Qian Cai
2019-03-27 10:48           ` William Kucharski
2019-03-27 11:50             ` Matthew Wilcox
2019-03-29  1:43           ` Qian Cai
2019-03-29 19:59             ` Matthew Wilcox
2019-03-29 21:25               ` Qian Cai
2019-03-30  3:04                 ` Matthew Wilcox
2019-03-30 14:10                   ` Matthew Wilcox [this message]
2019-03-31  3:23                     ` Matthew Wilcox
2019-04-01  9:18                       ` Kirill A. Shutemov
2019-04-01  9:27                         ` Kirill A. Shutemov
2019-04-04 13:10                           ` Qian Cai
2019-04-04 13:45                             ` Kirill A. Shutemov
2019-04-04 21:28                               ` Qian Cai
2019-04-05 13:37                                 ` Kirill A. Shutemov
2019-04-05 13:51                                   ` Matthew Wilcox

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