30 Aug, 2014
1 commit
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To avoid potential format string expansion via module parameters, do not
use the zpool type directly in request_module() without a format string.
Additionally, to avoid arbitrary modules being loaded via zpool API
(e.g. via the zswap_zpool_type module parameter) add a "zpool-" prefix
to the requested module, as well as module aliases for the existing
zpool types (zbud and zsmalloc).Signed-off-by: Kees Cook
Cc: Seth Jennings
Cc: Minchan Kim
Cc: Nitin Gupta
Acked-by: Dan Streetman
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
07 Aug, 2014
3 commits
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Update zbud and zsmalloc to implement the zpool api.
[fengguang.wu@intel.com: make functions static]
Signed-off-by: Dan Streetman
Tested-by: Seth Jennings
Cc: Minchan Kim
Cc: Nitin Gupta
Cc: Weijie Yang
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Add zpool api.
zpool provides an interface for memory storage, typically of compressed
memory. Users can select what backend to use; currently the only
implementations are zbud, a low density implementation with up to two
compressed pages per storage page, and zsmalloc, a higher density
implementation with multiple compressed pages per storage page.Signed-off-by: Dan Streetman
Tested-by: Seth Jennings
Cc: Minchan Kim
Cc: Nitin Gupta
Cc: Weijie Yang
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Currently map_vm_area() takes (struct page *** pages) as third argument,
and after mapping, it moves (*pages) to point to (*pages +
nr_mappped_pages).It looks like this kind of increment is useless to its caller these
days. The callers don't care about the increments and actually they're
trying to avoid this by passing another copy to map_vm_area().The caller can always guarantee all the pages can be mapped into vm_area
as specified in first argument and the caller only cares about whether
map_vm_area() fails or not.This patch cleans up the pointer movement in map_vm_area() and updates
its callers accordingly.Signed-off-by: WANG Chao
Cc: Zhang Yanfei
Acked-by: Greg Kroah-Hartman
Cc: Minchan Kim
Cc: Nitin Gupta
Cc: Rusty Russell
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
05 Jun, 2014
2 commits
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According to calculation, ZS_SIZE_CLASSES value is 255 on systems with 4K
page size, not 254. The old value may forget count the ZS_MIN_ALLOC_SIZE
in.This patch fixes this trivial issue in the comments.
Signed-off-by: Weijie Yang
Cc: Minchan Kim
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Replace places where __get_cpu_var() is used for an address calculation
with this_cpu_ptr().Signed-off-by: Christoph Lameter
Cc: Tejun Heo
Cc: Hugh Dickins
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
20 Mar, 2014
1 commit
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Subsystems that want to register CPU hotplug callbacks, as well as perform
initialization for the CPUs that are already online, often do it as shown
below:get_online_cpus();
for_each_online_cpu(cpu)
init_cpu(cpu);register_cpu_notifier(&foobar_cpu_notifier);
put_online_cpus();
This is wrong, since it is prone to ABBA deadlocks involving the
cpu_add_remove_lock and the cpu_hotplug.lock (when running concurrently
with CPU hotplug operations).Instead, the correct and race-free way of performing the callback
registration is:cpu_notifier_register_begin();
for_each_online_cpu(cpu)
init_cpu(cpu);/* Note the use of the double underscored version of the API */
__register_cpu_notifier(&foobar_cpu_notifier);cpu_notifier_register_done();
Fix the zsmalloc code by using this latter form of callback registration.
Cc: Nitin Gupta
Cc: Ingo Molnar
Signed-off-by: Srivatsa S. Bhat
Acked-by: Minchan Kim
Signed-off-by: Rafael J. Wysocki
31 Jan, 2014
2 commits
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Add my copyright to the zsmalloc source code which I maintain.
Signed-off-by: Minchan Kim
Cc: Nitin Gupta
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch moves zsmalloc under mm directory.
Before that, description will explain why we have needed custom
allocator.Zsmalloc is a new slab-based memory allocator for storing compressed
pages. It is designed for low fragmentation and high allocation success
rate on large object, but
Acked-by: Nitin Gupta
Reviewed-by: Konrad Rzeszutek Wilk
Cc: Bob Liu
Cc: Greg Kroah-Hartman
Cc: Hugh Dickins
Cc: Jens Axboe
Cc: Luigi Semenzato
Cc: Mel Gorman
Cc: Pekka Enberg
Cc: Rik van Riel
Cc: Seth Jennings
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
