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Message-Id: <1243429268-3028-1-git-send-email-jack@suse.cz> Date: Wed, 27 May 2009 15:00:57 +0200 From: Jan Kara <jack@...e.cz> To: LKML <linux-kernel@...r.kernel.org> Cc: npiggin@...e.de, linux-ext4@...r.kernel.org Subject: [PATCH 0/11] Fix page_mkwrite() for blocksize < pagesize patches below are an attempt to solve problems filesystems have with page_mkwrite() when blocksize < pagesize (see the changelog of the third patch for details). The series is against 2.6.30-rc7. The first two patches are just small cleanup and should be merged separately (Ted should have the ext4 cleanup rebased on top of current ext4 tree). For ext3 the fix is done in two phases, in the first we make it to correctly allocate space at page-fault time from page_mkwrite(). This has the disadvantage that under random mmaped writes, the file gets much more fragmented and performance of e.g. Berkeley DB drops by ~20%. Therefore in the second phase I've implemented delayed allocation for ext3 and blocks are just reserved during page_mkwrite time and really allocated only during writepage. This gets the performance back to original numbers for me. The patches should be fairly complete and sustained quite some testing. OTOH the area is kind of complex so please review them so that they can get merged. Thanks. Honza -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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