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Date: Tue, 22 Jul 2008 12:42:23 -0500 From: Eric Sandeen <sandeen@...hat.com> To: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> CC: cmm@...ibm.com, tytso@....edu, linux-ext4@...r.kernel.org Subject: Re: [PATCH] ext4: Don't allow lg prealloc list to be grow large. Aneesh Kumar K.V wrote: > Currently locality group prealloc list is freed only when there is a block allocation > failure. This can result in large number of per cpu locality group prealloc space > and also make the ext4_mb_use_preallocated expensive. Convert the locality group > prealloc list to a hash list. The hash index is the order of number of blocks > in the prealloc space with a max order of 9. When adding prealloc space to the > list we make sure total entries for each order does not exceed 8. If it is more > than 8 we discard few entries and make sure the we have only <= 5 entries. > This looks better on the particular benchmark: http://people.redhat.com/esandeen/ext4/fs_mark.png contains a run with this patch. I must admit to not actually reading the patch yet, though :) Just ran it in the background while working on some other things today. -Eric -- 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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