linux-ext4 - [PATCH 4/5] ext4: use correct criteria name instead stale integer number in comment

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Message-Id: <20240326213823.528302-5-shikemeng@huaweicloud.com>
Date: Wed, 27 Mar 2024 05:38:22 +0800
From: Kemeng Shi <shikemeng@...weicloud.com>
To: tytso@....edu,
	adilger.kernel@...ger.ca,
	linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: jack@...e.cz,
	ojaswin@...ux.ibm.com,
	ritesh.list@...il.com
Subject: [PATCH 4/5] ext4: use correct criteria name instead stale integer number in comment

Use correct criteria name instead stale integer number in comment

Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
---
 fs/ext4/ext4.h    | 15 ++++++++++++---
 fs/ext4/mballoc.c | 14 ++++++++------
 fs/ext4/mballoc.h |  4 ++--
 3 files changed, 22 insertions(+), 11 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 023571f8dd1b..9b90013c59a3 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -213,11 +213,20 @@ enum criteria {
 #define EXT4_MB_USE_RESERVED		0x2000
 /* Do strict check for free blocks while retrying block allocation */
 #define EXT4_MB_STRICT_CHECK		0x4000
-/* Large fragment size list lookup succeeded at least once for cr = 0 */
+/*
+ * Large fragment size list lookup succeeded at least once for cr =
+ * CR_POWER2_ALIGNED
+ */
 #define EXT4_MB_CR_POWER2_ALIGNED_OPTIMIZED		0x8000
-/* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */
+/*
+ * Avg fragment size rb tree lookup succeeded at least once for cr =
+ * CR_GOAL_LEN_FAST
+ */
 #define EXT4_MB_CR_GOAL_LEN_FAST_OPTIMIZED		0x00010000
-/* Avg fragment size rb tree lookup succeeded at least once for cr = 1.5 */
+/*
+ * Avg fragment size rb tree lookup succeeded at least once for cr =
+ * CR_BEST_AVAIL_LEN
+ */
 #define EXT4_MB_CR_BEST_AVAIL_LEN_OPTIMIZED		0x00020000
 
 struct ext4_allocation_request {
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 62d468379722..0f8a34513bf6 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -1131,8 +1131,9 @@ static void ext4_mb_choose_next_group(struct ext4_allocation_context *ac,
 		ext4_mb_choose_next_group_best_avail(ac, new_cr, group);
 	} else {
 		/*
-		 * TODO: For CR=2, we can arrange groups in an rb tree sorted by
-		 * bb_free. But until that happens, we should never come here.
+		 * TODO: For CR=CR_GOAL_LEN_SLOW, we can arrange groups in an
+		 * rb tree sorted by bb_free. But until that happens, we should
+		 * never come here.
 		 */
 		WARN_ON(1);
 	}
@@ -3444,10 +3445,11 @@ static int ext4_mb_init_backend(struct super_block *sb)
 	}
 	if (sbi->s_mb_prefetch > ext4_get_groups_count(sb))
 		sbi->s_mb_prefetch = ext4_get_groups_count(sb);
-	/* now many real IOs to prefetch within a single allocation at cr=0
-	 * given cr=0 is an CPU-related optimization we shouldn't try to
-	 * load too many groups, at some point we should start to use what
-	 * we've got in memory.
+	/*
+	 * now many real IOs to prefetch within a single allocation at
+	 * cr=CR_POWER2_ALIGNED. Given cr=CR_POWER2_ALIGNED is an CPU-related
+	 * optimization we shouldn't try to load too many groups, at some point
+	 * we should start to use what we've got in memory.
 	 * with an average random access time 5ms, it'd take a second to get
 	 * 200 groups (* N with flex_bg), so let's make this limit 4
 	 */
diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
index 56938532b4ce..042437d8860f 100644
--- a/fs/ext4/mballoc.h
+++ b/fs/ext4/mballoc.h
@@ -187,8 +187,8 @@ struct ext4_allocation_context {
 	struct ext4_free_extent ac_f_ex;
 
 	/*
-	 * goal len can change in CR1.5, so save the original len. This is
-	 * used while adjusting the PA window and for accounting.
+	 * goal len can change in CR_BEST_AVAIL_LEN, so save the original len.
+	 * This is used while adjusting the PA window and for accounting.
 	 */
 	ext4_grpblk_t	ac_orig_goal_len;
 
-- 
2.30.0