linux-kernel - Re: zswap: How to determine whether it is compressing swap pages?

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Message-ID: <4360.1374169009@turing-police.cc.vt.edu>
Date:	Thu, 18 Jul 2013 13:36:49 -0400
From:	Valdis.Kletnieks@...edu
To:	Bob Liu <bob.liu@...cle.com>
Cc:	Martin Steigerwald <Martin@...htvoll.de>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: zswap: How to determine whether it is compressing swap pages?

On Thu, 18 Jul 2013 20:43:40 +0800, Bob Liu said:

> Could you make some test by kernel compiling? Something like kernbench.
> During my testing, I found that the swap ins/outs operations reduced but
> the kernel compile time didn't reduce accordingly.

If your kernel source tree is cache-cold, the swap in/out activity is
probably hidden and ahrd to notice among all the disk I/O to read the source in.

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