ext4: start searching for the right extent from the goal group. (ed8f9c75) · Commits · 戴 / test

With mballoc we search for the best extent using different criteria. We should always use the goal group when we are starting with a new criteria. Signed-off-by:

Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by:

Mingming Cao <cmm@us.ibm.com> Signed-off-by:

"Theodore Ts'o" <tytso@mit.edu>

fs/ext4/mballoc.c

+6 −4

Original line number	Diff line number	Diff line
		@@ -1736,10 +1736,6 @@ ext4_mb_regular_allocator(struct ext4_allocation_context *ac)
		ac->ac_g_ex.fe_start = sbi->s_mb_last_start;
		spin_unlock(&sbi->s_md_lock);
		}

		/* searching for the right group start from the goal value specified */
		group = ac->ac_g_ex.fe_group;

		/* Let's just scan groups to find more-less suitable blocks */
		cr = ac->ac_2order ? 0 : 1;
		/*
		@@ -1749,6 +1745,12 @@ ext4_mb_regular_allocator(struct ext4_allocation_context *ac)
		repeat:
		for (; cr < 4 && ac->ac_status == AC_STATUS_CONTINUE; cr++) {
		ac->ac_criteria = cr;
		/*
		* searching for the right group start
		* from the goal value specified
		*/
		group = ac->ac_g_ex.fe_group;

		for (i = 0; i < EXT4_SB(sb)->s_groups_count; group++, i++) {
		struct ext4_group_info *grp;
		struct ext4_group_desc *desc;

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