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hugepage: convert huge zero page shrinker to new shrinker API 

It consists of:

* returning long instead of int
* separating count from scan
* returning the number of freed entities in scan

Signed-off-by: Glauber Costa <glommer@openvz.org>
Reviewed-by: Greg Thelen <gthelen@google.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Carlos Maiolino <cmaiolino@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: David Rientjes <rientjes@google.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: J. Bruce Fields <bfields@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Kent Overstreet <koverstreet@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Glauber Costa 2013-08-28 10:18:15 +10:00 committed by Al Viro
parent 81e49f8114
commit 488964666f
1 changed files with 11 additions and 6 deletions
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17
mm/huge_memory.c
View File

@ -211,24 +211,29 @@ static void put_huge_zero_page(void)
BUG_ON(atomic_dec_and_test(&huge_zero_refcount)); BUG_ON(atomic_dec_and_test(&huge_zero_refcount));
} }
static int shrink_huge_zero_page(struct shrinker *shrink, static unsigned long shrink_huge_zero_page_count(struct shrinker *shrink,
struct shrink_control *sc) struct shrink_control *sc)
{ {
if (!sc->nr_to_scan) /* we can free zero page only if last reference remains */
/* we can free zero page only if last reference remains */ return atomic_read(&huge_zero_refcount) == 1 ? HPAGE_PMD_NR : 0;
return atomic_read(&huge_zero_refcount) == 1 ? HPAGE_PMD_NR : 0; }
static unsigned long shrink_huge_zero_page_scan(struct shrinker *shrink,
struct shrink_control *sc)
{
if (atomic_cmpxchg(&huge_zero_refcount, 1, 0) == 1) { if (atomic_cmpxchg(&huge_zero_refcount, 1, 0) == 1) {
struct page *zero_page = xchg(&huge_zero_page, NULL); struct page *zero_page = xchg(&huge_zero_page, NULL);
BUG_ON(zero_page == NULL); BUG_ON(zero_page == NULL);
__free_page(zero_page); __free_page(zero_page);
return HPAGE_PMD_NR;
} }
return 0; return 0;
} }
static struct shrinker huge_zero_page_shrinker = { static struct shrinker huge_zero_page_shrinker = {
.shrink = shrink_huge_zero_page, .count_objects = shrink_huge_zero_page_count,
.scan_objects = shrink_huge_zero_page_scan,
.seeks = DEFAULT_SEEKS, .seeks = DEFAULT_SEEKS,
}; };