| To: | Bill Kendall <wkendall@xxxxxxx> |
|---|---|
| Subject: | Re: [PATCH v2 7/8] xfsdump: path lookup cache must be thread specific |
| From: | Alex Elder <aelder@xxxxxxx> |
| Date: | Mon, 7 Nov 2011 20:03:27 -0600 |
| Cc: | <xfs@xxxxxxxxxxx> |
| In-reply-to: | <1320699511-12281-8-git-send-email-wkendall@xxxxxxx> |
| References: | <1320699511-12281-1-git-send-email-wkendall@xxxxxxx> <1320699511-12281-8-git-send-email-wkendall@xxxxxxx> |
| Reply-to: | <aelder@xxxxxxx> |
On Mon, 2011-11-07 at 14:58 -0600, Bill Kendall wrote: > The xfsrestore path lookup routine (maps an ino + generation number to a > pathname) contains a cache for fast lookups of consecutive files in the > same parent directory. This cache either needs to be protected by a lock > or a cache is needed per thread. I took the latter approach since it > doesn't add lock contention and it increases the cache hit rate (it's > relatively unlikely that each stream is processing files in the same > directory). > > Signed-off-by: Bill Kendall <wkendall@xxxxxxx> > Reviewed-by: Christoph Hellwig <hch@xxxxxx> So you're fixing a bug, and making it work better at the same time, by simply adding one keyword. Looks good. Reviewed-by: Alex Elder <aelder@xxxxxxx> |
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