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authorTheodore Ts'o <tytso@mit.edu>2017-11-09 06:23:20 +0300
committerTheodore Ts'o <tytso@mit.edu>2017-11-09 06:23:20 +0300
commit232530680290ba94ca37852ab10d9556ea28badf (patch)
treecf23ba2b6c563adc685f3b9fee830ac7d202546c /fs/ext4/ext4.h
parentd77147ff443b255d82c907a632c825b2cc610b10 (diff)
downloadlinux-232530680290ba94ca37852ab10d9556ea28badf.tar.xz
ext4: improve smp scalability for inode generation
->s_next_generation is protected by s_next_gen_lock but its usage pattern is very primitive. We don't actually need sequentially increasing new generation numbers, so let's use prandom_u32() instead. Reported-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4.h')
-rw-r--r--fs/ext4/ext4.h2
1 files changed, 0 insertions, 2 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 53ce95b52fd8..5e6d7b6f50c7 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1355,8 +1355,6 @@ struct ext4_sb_info {
int s_first_ino;
unsigned int s_inode_readahead_blks;
unsigned int s_inode_goal;
- spinlock_t s_next_gen_lock;
- u32 s_next_generation;
u32 s_hash_seed[4];
int s_def_hash_version;
int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */