From: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
To: "J. Bruce Fields" <bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
Cc: Al Viro <viro-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>,
"J. Bruce Fields"
<bfields-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Subject: Re: [PATCH 4/4] dcache: don't clear DCACHE_DISCONNECTED too early
Date: Sat, 12 Oct 2013 01:42:35 -0700 [thread overview]
Message-ID: <20131012084235.GB5649@infradead.org> (raw)
In-Reply-To: <20131011160237.GA21258-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
On Fri, Oct 11, 2013 at 12:02:37PM -0400, J. Bruce Fields wrote:
> But just for fun--I did some cleanup and fixed some other quadratic
> behavior here and can notice a difference on lookups of very deep
> subdirectories.
>
> For example I'm seeing an uncached lookup of an 8000-deep directory
> taking about 6 seconds, and can get that down to a tenth of a second.
>
> I'm not sure yet if the difference on less extreme examples is really
> significant, I need to experiment some more.
>
> I'll do some more review and post patches and results.
This sounds like and awesome improvement. How much code do you have to
add for it?
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next prev parent reply other threads:[~2013-10-12 8:42 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-07 18:45 4 DCACHE_DISCONNECTED patches J. Bruce Fields
2013-09-07 18:45 ` [PATCH 2/4] dcache: make __d_shrink callers check d_unhashed() J. Bruce Fields
2013-09-07 18:46 ` [PATCH 4/4] dcache: don't clear DCACHE_DISCONNECTED too early J. Bruce Fields
[not found] ` <1378579561-26868-5-git-send-email-bfields-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-09-09 0:46 ` Al Viro
2013-09-09 7:45 ` Christoph Hellwig
[not found] ` <20130909004647.GK13318-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
2013-09-09 20:46 ` J. Bruce Fields
[not found] ` <20130909204655.GA10599-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2013-10-11 16:02 ` J. Bruce Fields
[not found] ` <20131011160237.GA21258-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2013-10-12 8:42 ` Christoph Hellwig [this message]
2013-10-15 19:29 ` J. Bruce Fields
[not found] ` <1378579561-26868-1-git-send-email-bfields-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-09-07 18:45 ` [PATCH 1/4] dcache: use IS_ROOT to decide where dentry is hashed J. Bruce Fields
2013-09-07 18:46 ` [PATCH 3/4] dcache: Don't set DISCONNECTED on "pseudo filesystem" dentries J. Bruce Fields
2013-09-08 9:16 ` 4 DCACHE_DISCONNECTED patches Christoph Hellwig
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