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f2fs: shrink spinlock coverage

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In f2fs_try_to_free_nids(), .nid_list_lock spinlock critical region will
increase as expected shrink number increase, to avoid spining other CPUs
for long time, we change to release nid caches with small batch each time
under .nid_list_lock coverage.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2020-05-08 17:50:20 +08:00 committed by Jaegeuk Kim
parent b8c0bb245e
commit 0627412db6
2 changed files with 18 additions and 10 deletions
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25
fs/f2fs/node.c
View file

@ -2488,7 +2488,6 @@ void f2fs_alloc_nid_failed(struct f2fs_sb_info *sbi, nid_t nid)
int f2fs_try_to_free_nids(struct f2fs_sb_info *sbi, int nr_shrink)
{
struct f2fs_nm_info *nm_i = NM_I(sbi);
struct free_nid *i, *next;
int nr = nr_shrink;
if (nm_i->nid_cnt[FREE_NID] <= MAX_FREE_NIDS)
@ -2497,17 +2496,23 @@ int f2fs_try_to_free_nids(struct f2fs_sb_info *sbi, int nr_shrink)
if (!mutex_trylock(&nm_i->build_lock))
return 0;
spin_lock(&nm_i->nid_list_lock);
list_for_each_entry_safe(i, next, &nm_i->free_nid_list, list) {
if (nr_shrink <= 0 ||
nm_i->nid_cnt[FREE_NID] <= MAX_FREE_NIDS)
break;
while (nr_shrink && nm_i->nid_cnt[FREE_NID] > MAX_FREE_NIDS) {
struct free_nid *i, *next;
unsigned int batch = SHRINK_NID_BATCH_SIZE;
__remove_free_nid(sbi, i, FREE_NID);
kmem_cache_free(free_nid_slab, i);
nr_shrink--;
spin_lock(&nm_i->nid_list_lock);
list_for_each_entry_safe(i, next, &nm_i->free_nid_list, list) {
if (!nr_shrink || !batch ||
nm_i->nid_cnt[FREE_NID] <= MAX_FREE_NIDS)
break;
__remove_free_nid(sbi, i, FREE_NID);
kmem_cache_free(free_nid_slab, i);
nr_shrink--;
batch--;
}
spin_unlock(&nm_i->nid_list_lock);
}
spin_unlock(&nm_i->nid_list_lock);
mutex_unlock(&nm_i->build_lock);
return nr - nr_shrink;

3
fs/f2fs/node.h
View file

@ -15,6 +15,9 @@
#define FREE_NID_PAGES 8
#define MAX_FREE_NIDS (NAT_ENTRY_PER_BLOCK * FREE_NID_PAGES)
/* size of free nid batch when shrinking */
#define SHRINK_NID_BATCH_SIZE 8
#define DEF_RA_NID_PAGES 0 /* # of nid pages to be readaheaded */
/* maximum readahead size for node during getting data blocks */