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ext4: simplify updating of fast commit stats
Move fast commit stats updating logic to a separate function from ext4_fc_commit(). This significantly improves readability of ext4_fc_commit(). Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20211223202140.2061101-4-harshads@google.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Harshad Shirwadkar
Theodore Ts'o
parent
7bbbe241ec
commit
0915e464cb
3 changed files with 67 additions and 58 deletions
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@ -1747,7 +1747,6 @@ struct ext4_sb_info {
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spinlock_t s_fc_lock;
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struct buffer_head *s_fc_bh;
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struct ext4_fc_stats s_fc_stats;
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u64 s_fc_avg_commit_time;
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#ifdef CONFIG_EXT4_DEBUG
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int s_fc_debug_max_replay;
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#endif
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@ -1075,6 +1075,32 @@ static int ext4_fc_perform_commit(journal_t *journal)
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return ret;
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}
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static void ext4_fc_update_stats(struct super_block *sb, int status,
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u64 commit_time, int nblks)
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{
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struct ext4_fc_stats *stats = &EXT4_SB(sb)->s_fc_stats;
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jbd_debug(1, "Fast commit ended with status = %d", status);
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if (status == EXT4_FC_STATUS_OK) {
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stats->fc_num_commits++;
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stats->fc_numblks += nblks;
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if (likely(stats->s_fc_avg_commit_time))
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stats->s_fc_avg_commit_time =
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(commit_time +
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stats->s_fc_avg_commit_time * 3) / 4;
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else
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stats->s_fc_avg_commit_time = commit_time;
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} else if (status == EXT4_FC_STATUS_FAILED ||
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status == EXT4_FC_STATUS_INELIGIBLE) {
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if (status == EXT4_FC_STATUS_FAILED)
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stats->fc_failed_commits++;
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stats->fc_ineligible_commits++;
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} else {
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stats->fc_skipped_commits++;
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}
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trace_ext4_fc_commit_stop(sb, nblks, status);
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}
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/*
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* The main commit entry point. Performs a fast commit for transaction
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* commit_tid if needed. If it's not possible to perform a fast commit
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@ -1087,7 +1113,7 @@ int ext4_fc_commit(journal_t *journal, tid_t commit_tid)
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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int nblks = 0, ret, bsize = journal->j_blocksize;
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int subtid = atomic_read(&sbi->s_fc_subtid);
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int reason = EXT4_FC_REASON_OK, fc_bufs_before = 0;
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int status = EXT4_FC_STATUS_OK, fc_bufs_before = 0;
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ktime_t start_time, commit_time;
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trace_ext4_fc_commit_start(sb);
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@ -1104,69 +1130,52 @@ int ext4_fc_commit(journal_t *journal, tid_t commit_tid)
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if (atomic_read(&sbi->s_fc_subtid) <= subtid &&
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commit_tid > journal->j_commit_sequence)
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goto restart_fc;
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reason = EXT4_FC_REASON_ALREADY_COMMITTED;
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goto out;
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ext4_fc_update_stats(sb, EXT4_FC_STATUS_SKIPPED, 0, 0);
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return 0;
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} else if (ret) {
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sbi->s_fc_stats.fc_ineligible_reason_count[EXT4_FC_COMMIT_FAILED]++;
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reason = EXT4_FC_REASON_FC_START_FAILED;
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goto out;
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/*
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* Commit couldn't start. Just update stats and perform a
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* full commit.
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*/
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ext4_fc_update_stats(sb, EXT4_FC_STATUS_FAILED, 0, 0);
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return jbd2_complete_transaction(journal, commit_tid);
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}
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/*
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* After establishing journal barrier via jbd2_fc_begin_commit(), check
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* if we are fast commit ineligible.
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*/
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if (ext4_test_mount_flag(sb, EXT4_MF_FC_INELIGIBLE)) {
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reason = EXT4_FC_REASON_INELIGIBLE;
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goto out;
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status = EXT4_FC_STATUS_INELIGIBLE;
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goto fallback;
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}
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fc_bufs_before = (sbi->s_fc_bytes + bsize - 1) / bsize;
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ret = ext4_fc_perform_commit(journal);
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if (ret < 0) {
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sbi->s_fc_stats.fc_ineligible_reason_count[EXT4_FC_COMMIT_FAILED]++;
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reason = EXT4_FC_REASON_FC_FAILED;
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goto out;
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status = EXT4_FC_STATUS_FAILED;
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goto fallback;
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}
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nblks = (sbi->s_fc_bytes + bsize - 1) / bsize - fc_bufs_before;
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ret = jbd2_fc_wait_bufs(journal, nblks);
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if (ret < 0) {
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sbi->s_fc_stats.fc_ineligible_reason_count[EXT4_FC_COMMIT_FAILED]++;
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reason = EXT4_FC_REASON_FC_FAILED;
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goto out;
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status = EXT4_FC_STATUS_FAILED;
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goto fallback;
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}
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atomic_inc(&sbi->s_fc_subtid);
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jbd2_fc_end_commit(journal);
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out:
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spin_lock(&sbi->s_fc_lock);
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if (reason != EXT4_FC_REASON_OK &&
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reason != EXT4_FC_REASON_ALREADY_COMMITTED) {
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sbi->s_fc_stats.fc_ineligible_commits++;
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} else {
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sbi->s_fc_stats.fc_num_commits++;
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sbi->s_fc_stats.fc_numblks += nblks;
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}
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spin_unlock(&sbi->s_fc_lock);
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nblks = (reason == EXT4_FC_REASON_OK) ? nblks : 0;
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trace_ext4_fc_commit_stop(sb, nblks, reason);
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commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time));
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ret = jbd2_fc_end_commit(journal);
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/*
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* weight the commit time higher than the average time so we don't
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* react too strongly to vast changes in the commit time
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* weight the commit time higher than the average time so we
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* don't react too strongly to vast changes in the commit time
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*/
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if (likely(sbi->s_fc_avg_commit_time))
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sbi->s_fc_avg_commit_time = (commit_time +
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sbi->s_fc_avg_commit_time * 3) / 4;
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else
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sbi->s_fc_avg_commit_time = commit_time;
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jbd_debug(1,
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"Fast commit ended with blks = %d, reason = %d, subtid - %d",
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nblks, reason, subtid);
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if (reason == EXT4_FC_REASON_FC_FAILED)
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return jbd2_fc_end_commit_fallback(journal);
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if (reason == EXT4_FC_REASON_FC_START_FAILED ||
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reason == EXT4_FC_REASON_INELIGIBLE)
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return jbd2_complete_transaction(journal, commit_tid);
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return 0;
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commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time));
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ext4_fc_update_stats(sb, status, commit_time, nblks);
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return ret;
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fallback:
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ret = jbd2_fc_end_commit_fallback(journal);
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ext4_fc_update_stats(sb, status, 0, 0);
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return ret;
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}
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/*
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@ -2124,7 +2133,7 @@ int ext4_fc_info_show(struct seq_file *seq, void *v)
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"fc stats:\n%ld commits\n%ld ineligible\n%ld numblks\n%lluus avg_commit_time\n",
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stats->fc_num_commits, stats->fc_ineligible_commits,
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stats->fc_numblks,
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div_u64(sbi->s_fc_avg_commit_time, 1000));
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div_u64(stats->s_fc_avg_commit_time, 1000));
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seq_puts(seq, "Ineligible reasons:\n");
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for (i = 0; i < EXT4_FC_REASON_MAX; i++)
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seq_printf(seq, "\"%s\":\t%d\n", fc_ineligible_reasons[i],
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@ -71,21 +71,19 @@ struct ext4_fc_tail {
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};
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/*
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* Fast commit reason codes
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* Fast commit status codes
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*/
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enum {
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/*
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* Commit status codes:
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*/
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EXT4_FC_REASON_OK = 0,
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EXT4_FC_REASON_INELIGIBLE,
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EXT4_FC_REASON_ALREADY_COMMITTED,
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EXT4_FC_REASON_FC_START_FAILED,
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EXT4_FC_REASON_FC_FAILED,
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EXT4_FC_STATUS_OK = 0,
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EXT4_FC_STATUS_INELIGIBLE,
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EXT4_FC_STATUS_SKIPPED,
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EXT4_FC_STATUS_FAILED,
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};
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/*
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* Fast commit ineligiblity reasons:
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*/
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/*
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* Fast commit ineligiblity reasons:
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*/
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enum {
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EXT4_FC_REASON_XATTR = 0,
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EXT4_FC_REASON_CROSS_RENAME,
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EXT4_FC_REASON_JOURNAL_FLAG_CHANGE,
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@ -117,7 +115,10 @@ struct ext4_fc_stats {
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unsigned int fc_ineligible_reason_count[EXT4_FC_REASON_MAX];
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unsigned long fc_num_commits;
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unsigned long fc_ineligible_commits;
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unsigned long fc_failed_commits;
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unsigned long fc_skipped_commits;
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unsigned long fc_numblks;
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u64 s_fc_avg_commit_time;
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};
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#define EXT4_FC_REPLAY_REALLOC_INCREMENT 4
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