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Date: Wed, 15 Nov 2006 18:54:03 +0900 From: "Takashi Sato" <sho@...s.nec.co.jp> To: "Alex Tomas" <alex@...sterfs.com> Cc: <linux-ext4@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>, "Jan Kara" <jack@...e.cz>, "Theodore Ts'o" <tytso@....edu> Subject: Re: [RFC] Ext3 online defrag Hi Alex, Thank you for your information. I have sent the patches of the defragmentation for a extent-based file on ext3 using your patches of the multi-block allocation. I'm happy if you have a time to review my patches. "[RFC][PATCH 0/3] Extent base online defrag" http://marc.theaimsgroup.com/?l=linux-ext4&m=116307062907075&w=2 And I'd like to start considering the defragmentation for ext4. Do you have a plan to update your patches for ext4? > I've been reworking mballoc with few new features: > > 1) in-core preallocation > like existing reservation, but can preallocate few pieces for a file > > 2) locality groups > to maintain groups of related files and flush them together. > say, two users are unpacking kernel. with delayed allocation > we've got bunch of files from the both in cache. then we flush > first set (few MBs) of files from one user, then from another. > this way write I/Os will be large enough to achieve good > throughput and files are still quite localized to be used later > at good read rate. > > 3) scalable reservation > required for delayed allocation to avoid -ENOSPC at flush time. > current version uses per-sb spinlock. > > probably we could add something for defragmentation? Cheers, Takashi - 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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