From: Michal Hocko <mhocko@suse.cz>
To: Rik van Riel <riel@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Al Viro <viro@zeniv.linux.org.uk>,
Johannes Weiner <hannes@cmpxchg.org>,
Mel Gorman <mgorman@suse.de>, Neil Brown <neilb@suse.de>,
Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
Sage Weil <sage@inktank.com>, Mark Fasheh <mfasheh@suse.com>,
linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm: Use GFP_KERNEL allocation for the page cache in page_cache_read
Date: Wed, 18 Mar 2015 15:55:28 +0100 [thread overview]
Message-ID: <20150318145528.GK17241@dhcp22.suse.cz> (raw)
In-Reply-To: <55098F3B.7070000@redhat.com>
On Wed 18-03-15 10:44:11, Rik van Riel wrote:
> On 03/18/2015 10:09 AM, Michal Hocko wrote:
> > page_cache_read has been historically using page_cache_alloc_cold to
> > allocate a new page. This means that mapping_gfp_mask is used as the
> > base for the gfp_mask. Many filesystems are setting this mask to
> > GFP_NOFS to prevent from fs recursion issues. page_cache_read is,
> > however, not called from the fs layer
>
> Is that true for filesystems that have directories in
> the page cache?
I haven't found any explicit callers of filemap_fault except for ocfs2
and ceph and those seem OK to me. Which filesystems you have in mind?
Btw. how would that work as we already have GFP_KERNEL allocation few
lines below?
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2015-03-18 14:55 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-18 14:09 [PATCH] mm: Use GFP_KERNEL allocation for the page cache in page_cache_read Michal Hocko
2015-03-18 14:32 ` Rik van Riel
2015-03-18 14:37 ` Michal Hocko
2015-03-18 14:38 ` Mel Gorman
2015-03-18 14:43 ` Michal Hocko
2015-03-18 14:44 ` Rik van Riel
2015-03-18 14:55 ` Michal Hocko [this message]
2015-03-19 7:14 ` Dave Chinner
2015-03-19 11:11 ` [PATCH] mm: Use GFP_KERNEL allocation for the page cache inpage_cache_read Tetsuo Handa
2015-03-19 12:44 ` [PATCH] mm: Use GFP_KERNEL allocation for the page cache in page_cache_read Michal Hocko
2015-03-20 3:48 ` Dave Chinner
2015-03-20 13:14 ` Michal Hocko
2015-03-20 22:51 ` Dave Chinner
2015-03-23 13:02 ` Michal Hocko
2015-03-26 9:53 ` Michal Hocko
2015-03-26 21:43 ` Dave Chinner
2015-03-30 8:22 ` Michal Hocko
2015-03-31 21:46 ` Dave Chinner
2015-04-07 12:16 ` Michal Hocko
2015-03-18 15:45 ` Michal Hocko
2015-03-18 21:38 ` NeilBrown
2015-03-19 13:55 ` Michal Hocko
2015-03-19 14:27 ` Michal Hocko
2015-03-20 3:57 ` Dave Chinner
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