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authorMichal Hocko <mhocko@suse.cz>2015-06-15 15:45:58 -0400
committerTheodore Ts'o <tytso@mit.edu>2015-06-15 15:45:58 -0400
commit7b506b1035326543b7cd2d768449ccbd1ef3f368 (patch)
tree7ec312baa0aee40eb0d1773b238b686fff1436b6
parentb03a2f7eb21cc06b541142684abf7eed6aaccf3e (diff)
downloadlinux-7b506b1035326543b7cd2d768449ccbd1ef3f368.tar.bz2
jbd2: get rid of open coded allocation retry loop
insert_revoke_hash does an open coded endless allocation loop if journal_oom_retry is true. It doesn't implement any allocation fallback strategy between the retries, though. The memory allocator doesn't know about the never fail requirement so it cannot potentially help to move on with the allocation (e.g. use memory reserves). Get rid of the retry loop and use __GFP_NOFAIL instead. We will lose the debugging message but I am not sure it is anyhow helpful. Do the same for journal_alloc_journal_head which is doing a similar thing. Signed-off-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
-rw-r--r--fs/jbd2/journal.c6
-rw-r--r--fs/jbd2/revoke.c15
2 files changed, 7 insertions, 14 deletions
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 5804466b5785..179d7d8733f2 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -2377,10 +2377,8 @@ static struct journal_head *journal_alloc_journal_head(void)
if (!ret) {
jbd_debug(1, "out of memory for journal_head\n");
pr_notice_ratelimited("ENOMEM in %s, retrying.\n", __func__);
- while (!ret) {
- yield();
- ret = kmem_cache_zalloc(jbd2_journal_head_cache, GFP_NOFS);
- }
+ ret = kmem_cache_zalloc(jbd2_journal_head_cache,
+ GFP_NOFS | __GFP_NOFAIL);
}
return ret;
}
diff --git a/fs/jbd2/revoke.c b/fs/jbd2/revoke.c
index 14214da80eb8..0abf2e7f725b 100644
--- a/fs/jbd2/revoke.c
+++ b/fs/jbd2/revoke.c
@@ -141,11 +141,13 @@ static int insert_revoke_hash(journal_t *journal, unsigned long long blocknr,
{
struct list_head *hash_list;
struct jbd2_revoke_record_s *record;
+ gfp_t gfp_mask = GFP_NOFS;
-repeat:
- record = kmem_cache_alloc(jbd2_revoke_record_cache, GFP_NOFS);
+ if (journal_oom_retry)
+ gfp_mask |= __GFP_NOFAIL;
+ record = kmem_cache_alloc(jbd2_revoke_record_cache, gfp_mask);
if (!record)
- goto oom;
+ return -ENOMEM;
record->sequence = seq;
record->blocknr = blocknr;
@@ -154,13 +156,6 @@ repeat:
list_add(&record->hash, hash_list);
spin_unlock(&journal->j_revoke_lock);
return 0;
-
-oom:
- if (!journal_oom_retry)
- return -ENOMEM;
- jbd_debug(1, "ENOMEM in %s, retrying\n", __func__);
- yield();
- goto repeat;
}
/* Find a revoke record in the journal's hash table. */