linux-stable.git/drivers/staging/zsmalloc, branch linux-3.7.y

zsmalloc: collapse internal .h into .c

2012-08-14T02:34:24+00:00

The patch collapses in the internal zsmalloc_int.h into
the zsmalloc-main.c file.

This is done in preparation for the promotion to mm/ where
separate internal headers are discouraged.

Signed-off-by: Seth Jennings 
Signed-off-by: Minchan Kim 
Acked-by: Nitin Gupta 
Reviewed-by: Konrad Rzeszutek Wilk 
Signed-off-by: Greg Kroah-Hartman

staging: zsmalloc: add page table mapping method

2012-08-14T02:28:09+00:00

This patchset provides page mapping via the page table.
On some archs, most notably ARM, this method has been
demonstrated to be faster than copying.

The logic controlling the method selection (copy vs page table)
is controlled by the definition of USE_PGTABLE_MAPPING which
is/can be defined for any arch that performs better with page
table mapping.

Signed-off-by: Seth Jennings 
Acked-by: Minchan Kim 
Signed-off-by: Greg Kroah-Hartman

staging: zsmalloc: prevent mappping in interrupt context

2012-08-14T02:28:08+00:00

Because we use per-cpu mapping areas shared among the
pools/users, we can't allow mapping in interrupt context
because it can corrupt another users mappings.

Signed-off-by: Seth Jennings 
Acked-by: Minchan Kim 
Signed-off-by: Greg Kroah-Hartman

staging: zsmalloc: s/firstpage/page in new copy map funcs

2012-08-14T02:28:08+00:00

firstpage already has precedent and meaning the first page
of a zspage.  In the case of the copy mapping functions,
it is the first of a pair of pages needing to be mapped.

This patch just renames the firstpage argument to "page" to
avoid confusion.

Signed-off-by: Seth Jennings 
Acked-by: Minchan Kim 
Signed-off-by: Greg Kroah-Hartman

staging: zsmalloc: add mapping modes

2012-07-09T18:35:00+00:00

This patch improves mapping performance in zsmalloc by getting
usage information from the user in the form of a "mapping mode"
and using it to avoid unnecessary copying for objects that span
pages.

Signed-off-by: Seth Jennings 
Signed-off-by: Greg Kroah-Hartman

staging: zsmalloc: add details to zs_map_object boiler plate

2012-07-09T18:34:59+00:00

Add information on the usage limits of zs_map_object()

Signed-off-by: Seth Jennings 
Signed-off-by: Greg Kroah-Hartman

staging: zsmalloc: add single-page object fastpath in unmap

2012-07-09T18:34:59+00:00

Improve zs_unmap_object() performance by adding a fast path for
objects that don't span pages.

Signed-off-by: Seth Jennings 
Signed-off-by: Greg Kroah-Hartman

staging: zsmalloc: remove x86 dependency

2012-07-09T18:34:59+00:00

This patch replaces the page table assisted object mapping
method, which has x86 dependencies, with a arch-independent
method that does a simple copy into a temporary per-cpu
buffer.

While a copy seems like it would be worse than mapping the pages,
tests demonstrate the copying is always faster and, in the case of
running inside a KVM guest, roughly 4x faster.

Signed-off-by: Seth Jennings 
Signed-off-by: Greg Kroah-Hartman

staging: zsmalloc: Finish conversion to a separate module

2012-06-20T23:11:34+00:00

ZSMALLOC is tristate, but the code has no MODULE_LICENSE and since it
depends on GPL-only symbols it cannot be loaded as a module.  This in
turn breaks zram which now depends on it.  I assume it's meant to be
Dual BSD/GPL like the other z-stuff.

There is also no module_exit, which will make it impossible to unload.
Add the appropriate module_init and module_exit declarations suggested
by comments.

Reported-by: Christian Ohm 
References: http://bugs.debian.org/677273
Cc: stable@vger.kernel.org # v3.4
Signed-off-by: Ben Hutchings 
Reviewed-by: Jonathan Nieder 
Signed-off-by: Greg Kroah-Hartman

staging: zsmalloc: fix uninit'ed variable warning

2012-06-14T00:21:46+00:00

This patch fixes an uninitialized variable warning in
alloc_zspage().  It also fixes the secondary issue of
prev_page leaving scope on each loop iteration.  The only
reason this ever worked was because prev_page was occupying
the same space on the stack on each iteration.

Signed-off-by: Seth Jennings 
Reported-by: Andrew Morton 
Signed-off-by: Greg Kroah-Hartman