From: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
To: "Machida, Hiroyuki" <machida@sm.sony.co.jp>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH][FAT] FAT dirent scan with hin take #2
Date: Wed, 31 Aug 2005 04:27:52 +0900 [thread overview]
Message-ID: <874q979qdj.fsf@devron.myhome.or.jp> (raw)
In-Reply-To: <4313E578.8070100@sm.sony.co.jp> (Hiroyuki Machida's message of "Tue, 30 Aug 2005 13:50:00 +0900")
"Machida, Hiroyuki" <machida@sm.sony.co.jp> writes:
> Here is a revised version of dirent scan patch, mentioned at
> following E-mail.
>
> This patch addresses performance damages on "ls | xargs xxx" and
> reverse order scan which are reported to the previous patch.
>
> With this patch, fat_search_long() and fat_scan() use hint value
> as start of scan. For each directory holds multiple hint value entries.
> The entry would be selected by hash value based on scan target name and
> PID. Hint value would be calculated based on the entry previously found
> entry, so that the hint can cover backward neighborhood.
This patch couldn't compile. I assume you post a wrong patch...?
The code is strange... Is the hint value related to the previously
accessed entry?
This seems to be randomly cacheing the recent access position... Is
it your intention of this patch?
--
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
next prev parent reply other threads:[~2005-08-30 19:28 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-30 3:01 [RFC][FAT] diren scan profiling report Machida, Hiroyuki
2005-08-30 4:50 ` [PATCH][FAT] FAT dirent scan with hin take #2 Machida, Hiroyuki
2005-08-30 8:51 ` Pekka Enberg
2005-08-30 8:55 ` Pekka Enberg
2005-08-30 9:18 ` Vojtech Pavlik
2005-08-30 19:27 ` OGAWA Hirofumi [this message]
2005-08-31 1:43 ` OGAWA Hirofumi
2005-08-31 8:25 ` [PATCH][FAT] FAT dirent scan with hin take #3 Machida, Hiroyuki
2005-08-31 10:00 ` Pekka Enberg
2005-08-31 12:57 ` Machida, Hiroyuki
2005-08-31 13:51 ` Pekka Enberg
2005-08-31 13:53 ` Pekka Enberg
2005-08-31 10:03 ` Pekka Enberg
2005-08-31 13:27 ` Machida, Hiroyuki
2005-08-31 10:14 ` Pekka Enberg
2005-08-31 13:04 ` Machida, Hiroyuki
2005-08-31 13:52 ` Pekka Enberg
2005-08-31 16:41 ` OGAWA Hirofumi
2005-09-01 5:50 ` Machida, Hiroyuki
2005-09-01 7:45 ` Machida, Hiroyuki
2005-09-01 17:48 ` OGAWA Hirofumi
2005-09-14 18:59 ` Machida, Hiroyuki
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