On 08/25/2011 01:05 AM, KAMEZAWA Hiroyuki wrote:

On Tue, 23 Aug 2011 07:58:15 -0700
Dan Magenheimer [off-list ref] wrote:

quoted

From: Dan Magenheimer <redacted>
Subject: [PATCH V7 2/4] mm: frontswap: core code

This second patch of four in this frontswap series provides the core code
for frontswap that interfaces between the hooks in the swap subsystem and
a frontswap backend via frontswap_ops.

Two new files are added: mm/frontswap.c and include/linux/frontswap.h

Credits: Frontswap_ops design derived from Jeremy Fitzhardinge
design for tmem; sysfs code modelled after mm/ksm.c

[v7: rebase to 3.0-rc3]
[v7: JBeulich@novell.com: new static inlines resolve to no-ops if not config'd]
[v7: JBeulich@novell.com: avoid redundant shifts/divides for *_bit lib calls]
[v6: rebase to 3.1-rc1]
[v6: lliubbo@gmail.com: fix null pointer deref if vzalloc fails]
[v6: konrad.wilk@oracl.com: various checks and code clarifications/comments]
[v5: no change from v4]
[v4: rebase to 2.6.39]
Signed-off-by: Dan Magenheimer <redacted>
Reviewed-by: Konrad Wilk <redacted>
Acked-by: Jan Beulich <redacted>
Acked-by: Seth Jennings <redacted>
Cc: Jeremy Fitzhardinge <redacted>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Nitin Gupta <redacted>
Cc: Matthew Wilcox <redacted>
Cc: Chris Mason <redacted>
Cc: Rik Riel <redacted>
Cc: Andrew Morton <akpm@linux-foundation.org>

<cut>

I'm sorry if I miss codes but.... is an implementation of frontswap.ops included
in this patch set ? Or how to test the work ?

The zcache driver (in drivers/staging/zcache) is the one that registers frontswap ops.

You can test frontswap by enabling CONFIG_FRONTSWAP and CONFIG_ZCACHE, and putting 
"zcache" in the kernel boot parameters.

Thanks,
-Kame

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