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shrinker: Kill old ->shrink API.

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There are no more users of this API, so kill it dead, dead, dead and
quietly bury the corpse in a shallow, unmarked grave in a dark forest deep
in the hills...

[glommer@openvz.org: added flowers to the grave]
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Glauber Costa <glommer@openvz.org>
Reviewed-by: Greg Thelen <gthelen@google.com>
Acked-by: Mel Gorman <mgorman@suse.de>
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:
Dave Chinner 2013-08-28 10:18:16 +10:00 committed by Al Viro
parent 70534a739c
commit a0b02131c5
3 changed files with 15 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
include/linux/shrinker.h
View File

@ -7,14 +7,15 @@
*
* The 'gfpmask' refers to the allocation we are currently trying to
* fulfil.
*
* Note that 'shrink' will be passed nr_to_scan == 0 when the VM is
* querying the cache size, so a fastpath for that case is appropriate.
*/
struct shrink_control {
gfp_t gfp_mask;
/* How many slab objects shrinker() should scan and try to reclaim */
/*
* How many objects scan_objects should scan and try to reclaim.
* This is reset before every call, so it is safe for callees
* to modify.
*/
unsigned long nr_to_scan;
/* shrink from these nodes */
@ -27,11 +28,6 @@ struct shrink_control {
/*
* A callback you can register to apply pressure to ageable caches.
*
* @shrink() should look through the least-recently-used 'nr_to_scan' entries
* and attempt to free them up. It should return the number of objects which
* remain in the cache. If it returns -1, it means it cannot do any scanning at
* this time (eg. there is a risk of deadlock).
*
* @count_objects should return the number of freeable items in the cache. If
* there are no objects to free or the number of freeable items cannot be
* determined, it should return 0. No deadlock checks should be done during the
@ -50,7 +46,6 @@ struct shrink_control {
* @flags determine the shrinker abilities, like numa awareness
*/
struct shrinker {
int (*shrink)(struct shrinker *, struct shrink_control *sc);
unsigned long (*count_objects)(struct shrinker *,
struct shrink_control *sc);
unsigned long (*scan_objects)(struct shrinker *,

4
include/trace/events/vmscan.h
View File

@ -202,7 +202,7 @@ TRACE_EVENT(mm_shrink_slab_start,
TP_fast_assign(
__entry->shr = shr;
__entry->shrink = shr->shrink;
__entry->shrink = shr->scan_objects;
__entry->nr_objects_to_shrink = nr_objects_to_shrink;
__entry->gfp_flags = sc->gfp_mask;
__entry->pgs_scanned = pgs_scanned;
@ -241,7 +241,7 @@ TRACE_EVENT(mm_shrink_slab_end,
TP_fast_assign(
__entry->shr = shr;
__entry->shrink = shr->shrink;
__entry->shrink = shr->scan_objects;
__entry->unused_scan = unused_scan_cnt;
__entry->new_scan = new_scan_cnt;
__entry->retval = shrinker_retval;

41
mm/vmscan.c
View File

@ -194,14 +194,6 @@ void unregister_shrinker(struct shrinker *shrinker)
}
EXPORT_SYMBOL(unregister_shrinker);
static inline int do_shrinker_shrink(struct shrinker *shrinker,
struct shrink_control *sc,
unsigned long nr_to_scan)
{
sc->nr_to_scan = nr_to_scan;
return (*shrinker->shrink)(shrinker, sc);
}
#define SHRINK_BATCH 128
static unsigned long
@ -218,10 +210,7 @@ shrink_slab_node(struct shrink_control *shrinkctl, struct shrinker *shrinker,
long batch_size = shrinker->batch ? shrinker->batch
: SHRINK_BATCH;
if (shrinker->count_objects)
max_pass = shrinker->count_objects(shrinker, shrinkctl);
else
max_pass = do_shrinker_shrink(shrinker, shrinkctl, 0);
max_pass = shrinker->count_objects(shrinker, shrinkctl);
if (max_pass == 0)
return 0;
@ -240,7 +229,7 @@ shrink_slab_node(struct shrink_control *shrinkctl, struct shrinker *shrinker,
if (total_scan < 0) {
printk(KERN_ERR
"shrink_slab: %pF negative objects to delete nr=%ld\n",
shrinker->shrink, total_scan);
shrinker->scan_objects, total_scan);
total_scan = max_pass;
}
@ -272,27 +261,13 @@ shrink_slab_node(struct shrink_control *shrinkctl, struct shrinker *shrinker,
max_pass, delta, total_scan);
while (total_scan >= batch_size) {
unsigned long ret;
if (shrinker->scan_objects) {
unsigned long ret;
shrinkctl->nr_to_scan = batch_size;
ret = shrinker->scan_objects(shrinker, shrinkctl);
if (ret == SHRINK_STOP)
break;
freed += ret;
} else {
int nr_before;
long ret;
nr_before = do_shrinker_shrink(shrinker, shrinkctl, 0);
ret = do_shrinker_shrink(shrinker, shrinkctl,
batch_size);
if (ret == -1)
break;
if (ret < nr_before)
freed += nr_before - ret;
}
shrinkctl->nr_to_scan = batch_size;
ret = shrinker->scan_objects(shrinker, shrinkctl);
if (ret == SHRINK_STOP)
break;
freed += ret;
count_vm_events(SLABS_SCANNED, batch_size);
total_scan -= batch_size;