linux-kernel - Re: [PATCH] mm: swap prefetch improvements

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 23 May 2007 08:50:01 +1000
From:	Con Kolivas <kernel@...ivas.org>
To:	ck@....kolivas.org
Cc:	Ash Milsted <thatistosayiseenem@...ab.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: swap prefetch improvements

On Wednesday 23 May 2007 06:42, Ash Milsted wrote:
> Hi. I just did some video encoding on my desktop and I was noticing
> (for the first time in a while) that running apps had to hit swap quite
> a lot when I switched to them (the encoding was going at full blast for
> most of the day, and most of the time other running apps were
> idle). Now, a good half of my RAM appeared to be free during all this,
> so I was thinking at the time that it would be nice if swap prefetch
> could be tunably more aggressive. I guess it would be ideal in this
> case if it could kick in during tunably low disk-IO periods, even if
> the CPU is rather busy. I'm sure you've considered this, so I only butt
> in here to cast a vote for it. :)

In this case nicing the video encode should be enough to make it prefetch even 
during heavy cpu usage. It detects the total nice level rather than the cpu 
usage.

> Of course, I could be completely wrong about the possibility.. and I
> seem to remember that the disk cache can take up about half the ram by
> default without this showing up in 'gnome-system-monitor'... which I
> guess might happen during heavy encoding.. but even if it did, I could
> have set the limit lower, and would then have still appreciated
> prefetching.

I plan to make it prefetch more aggressively by default soon and make it more 
tunable too.

-- 
-ck
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/