From: "Namjae Jeon" <namjae.jeon@samsung.com>
To: "'Sungjong Seo'" <sj1557.seo@samsung.com>,
"'Hyeongseok Kim'" <hyeongseok@gmail.com>
Cc: <linux-kernel@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>
Subject: RE: [PATCH v3] exfat: speed up iterate/lookup by fixing start point of traversing cluster chain
Date: Tue, 23 Mar 2021 17:26:26 +0900 [thread overview]
Message-ID: <010601d71fbe$37b62450$a7226cf0$@samsung.com> (raw)
In-Reply-To: <016101d71edf$8542b240$8fc816c0$@samsung.com>
> > When directory iterate and lookup is called, there's a buggy rewinding
> > of start point for traversing cluster chain to the parent directory
> > entry's first cluster. This caused repeated cluster chain traversing
> > from the first entry of the parent directory that would show worse
> > performance if huge amounts of files exist under the parent directory.
> > Fix not to rewind, make continue from currently referenced cluster and
> > dir entry.
> >
> > Tested with 50,000 files under single directory / 256GB sdcard, with
> > command "time ls -l > /dev/null",
> > Before : 0m08.69s real 0m00.27s user 0m05.91s system
> > After : 0m07.01s real 0m00.25s user 0m04.34s system
> >
> > Signed-off-by: Hyeongseok Kim <hyeongseok@gmail.com>
>
> Looks good.
> Thanks for your contribution.
>
> Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com>
Applied. Thanks!
prev parent reply other threads:[~2021-03-23 8:27 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20210322035356epcas1p35cf4d476030f5ebaf6357c5761355605@epcas1p3.samsung.com>
2021-03-22 3:53 ` [PATCH v3] exfat: speed up iterate/lookup by fixing start point of traversing cluster chain Hyeongseok Kim
2021-03-22 5:52 ` Sungjong Seo
2021-03-23 8:26 ` Namjae Jeon [this message]
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