glock.c (55f841ce9395a72c6285fbcc4c403c0c786e1c74) glock.c (1ab6c4997e04a00c50c6d786c2f046adc0d1f5de)
1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */

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1422 * gfs2_scan_glock_lru - Scan the LRU looking for locks to demote
1423 * @nr: The number of entries to scan
1424 *
1425 * This function selects the entries on the LRU which are able to
1426 * be demoted, and then kicks off the process by calling
1427 * gfs2_dispose_glock_lru() above.
1428 */
1429
1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */

--- 1413 unchanged lines hidden (view full) ---

1422 * gfs2_scan_glock_lru - Scan the LRU looking for locks to demote
1423 * @nr: The number of entries to scan
1424 *
1425 * This function selects the entries on the LRU which are able to
1426 * be demoted, and then kicks off the process by calling
1427 * gfs2_dispose_glock_lru() above.
1428 */
1429
1430static void gfs2_scan_glock_lru(int nr)
1430static long gfs2_scan_glock_lru(int nr)
1431{
1432 struct gfs2_glock *gl;
1433 LIST_HEAD(skipped);
1434 LIST_HEAD(dispose);
1431{
1432 struct gfs2_glock *gl;
1433 LIST_HEAD(skipped);
1434 LIST_HEAD(dispose);
1435 long freed = 0;
1435
1436 spin_lock(&lru_lock);
1436
1437 spin_lock(&lru_lock);
1437 while(nr && !list_empty(&lru_list)) {
1438 while ((nr-- >= 0) && !list_empty(&lru_list)) {
1438 gl = list_entry(lru_list.next, struct gfs2_glock, gl_lru);
1439
1440 /* Test for being demotable */
1441 if (!test_and_set_bit(GLF_LOCK, &gl->gl_flags)) {
1442 list_move(&gl->gl_lru, &dispose);
1443 atomic_dec(&lru_count);
1439 gl = list_entry(lru_list.next, struct gfs2_glock, gl_lru);
1440
1441 /* Test for being demotable */
1442 if (!test_and_set_bit(GLF_LOCK, &gl->gl_flags)) {
1443 list_move(&gl->gl_lru, &dispose);
1444 atomic_dec(&lru_count);
1444 nr--;
1445 freed++;
1445 continue;
1446 }
1447
1448 list_move(&gl->gl_lru, &skipped);
1449 }
1450 list_splice(&skipped, &lru_list);
1451 if (!list_empty(&dispose))
1452 gfs2_dispose_glock_lru(&dispose);
1453 spin_unlock(&lru_lock);
1446 continue;
1447 }
1448
1449 list_move(&gl->gl_lru, &skipped);
1450 }
1451 list_splice(&skipped, &lru_list);
1452 if (!list_empty(&dispose))
1453 gfs2_dispose_glock_lru(&dispose);
1454 spin_unlock(&lru_lock);
1455
1456 return freed;
1454}
1455
1457}
1458
1456static int gfs2_shrink_glock_memory(struct shrinker *shrink,
1457 struct shrink_control *sc)
1459static unsigned long gfs2_glock_shrink_scan(struct shrinker *shrink,
1460 struct shrink_control *sc)
1458{
1461{
1459 if (sc->nr_to_scan) {
1460 if (!(sc->gfp_mask & __GFP_FS))
1461 return -1;
1462 gfs2_scan_glock_lru(sc->nr_to_scan);
1463 }
1462 if (!(sc->gfp_mask & __GFP_FS))
1463 return SHRINK_STOP;
1464 return gfs2_scan_glock_lru(sc->nr_to_scan);
1465}
1464
1466
1467static unsigned long gfs2_glock_shrink_count(struct shrinker *shrink,
1468 struct shrink_control *sc)
1469{
1465 return vfs_pressure_ratio(atomic_read(&lru_count));
1466}
1467
1468static struct shrinker glock_shrinker = {
1470 return vfs_pressure_ratio(atomic_read(&lru_count));
1471}
1472
1473static struct shrinker glock_shrinker = {
1469 .shrink = gfs2_shrink_glock_memory,
1470 .seeks = DEFAULT_SEEKS,
1474 .seeks = DEFAULT_SEEKS,
1475 .count_objects = gfs2_glock_shrink_count,
1476 .scan_objects = gfs2_glock_shrink_scan,
1471};
1472
1473/**
1474 * examine_bucket - Call a function for glock in a hash bucket
1475 * @examiner: the function
1476 * @sdp: the filesystem
1477 * @bucket: the bucket
1478 *

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1478
1479/**
1480 * examine_bucket - Call a function for glock in a hash bucket
1481 * @examiner: the function
1482 * @sdp: the filesystem
1483 * @bucket: the bucket
1484 *

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