From: Pavel Machek <pavel@suse.cz>
To: Nigel Cunningham <ncunningham@linuxmail.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: is_head_of_free_region slowing down swsusp
Date: Fri, 13 Aug 2004 01:22:42 +0200 [thread overview]
Message-ID: <20040812232242.GI15138@elf.ucw.cz> (raw)
In-Reply-To: <1092350569.24776.22.camel@laptop.cunninghams>
Hi!
> > is_head_of_free_region with count_and_copy_zone results results in
> > pretty nasty O(number_of_free_regions^2) behaviour, and some users see
> > cpu spending 40 seconds there :-(.
> >
> > Actually count_and_copy_zone would probably be happy with
> > "is_free_page()".
>
> Take a look at my implementation. I do a one-time pass through the slow
> path, building a bitmap of free pages. is_head_of_free_region is then
> simply a O(1) loop through the bitmap.
I've seen that solution (thanks)... I'd like to do something simpler.
Pavel
--
People were complaining that M$ turns users into beta-testers...
...jr ghea gurz vagb qrirybcref, naq gurl frrz gb yvxr vg gung jnl!
next prev parent reply other threads:[~2004-08-12 23:27 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-12 22:23 Pavel Machek
2004-08-12 22:42 ` Nigel Cunningham
2004-08-12 23:22 ` Pavel Machek [this message]
2004-08-13 5:51 ` Nigel Cunningham
2004-08-13 10:21 ` Pavel Machek
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