diff options
| author | Ojaswin Mujoo <ojaswin@linux.ibm.com> | 2023-05-30 15:33:44 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2023-06-27 02:34:56 +0300 |
| commit | 3ef5d263879696027c70548532a94418aad3bd95 (patch) | |
| tree | f7a1f131cf418aeea496d3473dc9d024d00d3c4f /fs/ext4/mballoc.c | |
| parent | fdd9a00943a5f6687937628e01506dad697c9140 (diff) | |
| download | linux-3ef5d263879696027c70548532a94418aad3bd95.tar.xz | |
ext4: Add counter to track successful allocation of goal length
Track number of allocations where the length of blocks allocated is equal to the
length of goal blocks (post normalization). This metric could be useful if
making changes to the allocator logic in the future as it could give us
visibility into how often do we trim our requests.
PS: ac_b_ex.fe_len might get modified due to preallocation efforts and
hence we use ac_f_ex.fe_len instead since we want to compare how much the
allocator was able to actually find.
Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/343620e2be8a237239ea2613a7a866ee8607e973.1685449706.git.ojaswin@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/mballoc.c')
| -rw-r--r-- | fs/ext4/mballoc.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index e28731426ee5..64d3760e4bcf 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -2965,6 +2965,7 @@ int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset) atomic64_read(&sbi->s_bal_cX_failed[CR3])); seq_printf(seq, "\textents_scanned: %u\n", atomic_read(&sbi->s_bal_ex_scanned)); seq_printf(seq, "\t\tgoal_hits: %u\n", atomic_read(&sbi->s_bal_goals)); + seq_printf(seq, "\t\tlen_goal_hits: %u\n", atomic_read(&sbi->s_bal_len_goals)); seq_printf(seq, "\t\t2^n_hits: %u\n", atomic_read(&sbi->s_bal_2orders)); seq_printf(seq, "\t\tbreaks: %u\n", atomic_read(&sbi->s_bal_breaks)); seq_printf(seq, "\t\tlost: %u\n", atomic_read(&sbi->s_mb_lost_chunks)); @@ -4410,6 +4411,8 @@ static void ext4_mb_collect_stats(struct ext4_allocation_context *ac) if (ac->ac_g_ex.fe_start == ac->ac_b_ex.fe_start && ac->ac_g_ex.fe_group == ac->ac_b_ex.fe_group) atomic_inc(&sbi->s_bal_goals); + if (ac->ac_f_ex.fe_len == ac->ac_g_ex.fe_len) + atomic_inc(&sbi->s_bal_len_goals); if (ac->ac_found > sbi->s_mb_max_to_scan) atomic_inc(&sbi->s_bal_breaks); } |