linux.git/drivers/staging/zcache/zcache-main.c, branch v3.10

staging: zcache: Fix incorrect module_param_array types

2013-05-16T22:37:51+00:00

drivers/staging/zcache/zcache-main.c: In function ‘__check_disable_cleancache’:
drivers/staging/zcache/zcache-main.c:1928: warning: return from incompatible pointer type
drivers/staging/zcache/zcache-main.c: In function ‘__check_disable_frontswap’:
drivers/staging/zcache/zcache-main.c:1929: warning: return from incompatible pointer type
drivers/staging/zcache/zcache-main.c: In function ‘__check_disable_frontswap_ignore_nonactive’:
drivers/staging/zcache/zcache-main.c:1933: warning: return from incompatible pointer type

Signed-off-by: Geert Uytterhoeven 
Signed-off-by: Greg Kroah-Hartman

staging: zcache: enable zcache to be built/loaded as a module

2013-05-01T00:04:01+00:00

Allow zcache to be built/loaded as a module.  Note runtime dependency
disallows loading if cleancache/frontswap lazy initialization patches
are not present.  Zsmalloc support has not yet been merged into zcache
but, once merged, could now easily be selected via a module_param.

If built-in (not built as a module), the original mechanism of enabling
via a kernel boot parameter is retained, but this should be considered
deprecated.

Note that module unload is explicitly not yet supported.

Signed-off-by: Dan Magenheimer 
[v1: Rebased with different order of patches]
[v2: Removed [CLEANCACHE|FRONTSWAP]_HAS_LAZY_INIT ifdef]
[v3: Rebased on top of ramster->zcache move]
[v4: Redid the Makefile]
[v5: s/ZCACHE2/ZCACHE/]
Signed-off-by: Konrad Rzeszutek Wilk 
Signed-off-by: Bob Liu 
Cc: Wanpeng Li 
Cc: Andor Daam 
Cc: Florian Schmaus 
Cc: Minchan Kim 
Cc: Stefan Hengelein 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

staging: zcache: enable ramster to be built/loaded as a module

2013-05-01T00:04:01+00:00

Enable module support for ramster.  Note runtime dependency disallows
loading if cleancache/frontswap lazy initialization patches are not
present.

If built-in (not built as a module), the original mechanism of enabling
via a kernel boot parameter is retained, but this should be considered
deprecated.

Note that module unload is explicitly not yet supported.

[v1: Fixed compile issues since ramster_init now has four arguments]
[v2: Fixed rebase on ramster->zcache move]
[akpm@linux-foundation.org: use_frontswap_selfshrink cannot be __initdata]
Signed-off-by: Dan Magenheimer 
Signed-off-by: Konrad Rzeszutek Wilk 
Signed-off-by: Bob Liu 
Cc: Wanpeng Li 
Cc: Andor Daam 
Cc: Florian Schmaus 
Cc: Minchan Kim 
Cc: Stefan Hengelein 
Cc: Wu Fengguang 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

zcache/tmem: Better error checking on frontswap_register_ops return value.

2013-05-01T00:04:01+00:00

In the past it either used to be NULL or the "older" backend. Now we
also return -Exx error codes.

Signed-off-by: Konrad Rzeszutek Wilk 
Signed-off-by: Bob Liu 
Cc: Wanpeng Li 
Cc: Andor Daam 
Cc: Dan Magenheimer 
Cc: Florian Schmaus 
Cc: Minchan Kim 
Cc: Stefan Hengelein 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

cleancache: Make cleancache_init use a pointer for the ops

2013-05-01T00:04:01+00:00

Instead of using a backend_registered to determine whether a backend is
enabled.  This allows us to remove the backend_register check and just
do 'if (cleancache_ops)'

[v1: Rebase on top of b97c4b430b0a (ramster->zcache move]
Signed-off-by: Konrad Rzeszutek Wilk 
Signed-off-by: Bob Liu 
Cc: Wanpeng Li 
Cc: Andor Daam 
Cc: Dan Magenheimer 
Cc: Florian Schmaus 
Cc: Minchan Kim 
Cc: Stefan Hengelein 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

frontswap: make frontswap_init use a pointer for the ops

2013-05-01T00:04:00+00:00

This simplifies the code in the frontswap - we can get rid of the
'backend_registered' test and instead check against frontswap_ops.

[v1: Rebase on top of 703ba7fe5e0 (ramster->zcache move]
Signed-off-by: Konrad Rzeszutek Wilk 
Signed-off-by: Bob Liu 
Cc: Wanpeng Li 
Cc: Andor Daam 
Cc: Dan Magenheimer 
Cc: Florian Schmaus 
Cc: Minchan Kim 
Cc: Stefan Hengelein 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

staging: zcache: fix account foregin counters against zero-filled pages

2013-04-11T19:58:39+00:00

zero-filled pages won't be compressed and sent to remote system. Monitor
the number ephemeral and persistent pages that Ramster has sent make no
sense. This patch skip account foregin counters against zero-filled pages.

Signed-off-by: Wanpeng Li 
Acked-by: Dan Magenheimer 
Signed-off-by: Greg Kroah-Hartman

staging: zcache: introduce zero-filled page stat count

2013-04-03T20:38:37+00:00

Introduce zero-filled page statistics to monitor the number of
zero-filled pages.

Acked-by: Dan Magenheimer 
Signed-off-by: Wanpeng Li 
Reviewed-by: Konrad Rzeszutek Wilk 
Signed-off-by: Greg Kroah-Hartman

staging: zcache: handle zcache_[eph|pers]_zpages for zero-filled page

2013-04-02T19:49:51+00:00

Increment/decrement zcache_[eph|pers]_zpages for zero-filled pages,
the main point of the counters for zpages and pageframes is to be
able to calculate density == zpages/pageframes. A zero-filled page
becomes a zpage that "compresses" to zero bytes and, as a result,
requires zero pageframes for storage. So the zpages counter should
be increased but the pageframes counter should not.

[Dan Magenheimer : patch description]
Acked-by: Dan Magenheimer 
Reviewed-by: Konrad Rzeszutek Wilk 
Signed-off-by: Wanpeng Li 
Signed-off-by: Greg Kroah-Hartman

staging: zcache: zero-filled pages awareness

2013-04-02T19:49:51+00:00

Compression of zero-filled pages can unneccessarily cause internal
fragmentation, and thus waste memory. This special case can be
optimized.

This patch captures zero-filled pages, and marks their corresponding
zcache backing page entry as zero-filled. Whenever such zero-filled
page is retrieved, we fill the page frame with zero.

Acked-by: Dan Magenheimer 
Reviewed-by: Konrad Rzeszutek Wilk 
Signed-off-by: Wanpeng Li 
Signed-off-by: Greg Kroah-Hartman