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ext4: stop looping in ext4_num_dirty_pages when max_pages reached

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Today we simply break out of the inner loop when we have accumulated
max_pages; this keeps scanning forwad and doing pagevec_lookup_tag()
in the while (!done) loop, this does potentially a lot of work
with no net effect.

When we have accumulated max_pages, just clean up and return.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Eric Sandeen 2010-10-27 21:30:03 -04:00 committed by Theodore Ts'o
parent fb1813f4a8
commit 659c6009ca
1 changed files with 3 additions and 1 deletions
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fs/ext4/inode.c
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@ -1207,9 +1207,11 @@ static pgoff_t ext4_num_dirty_pages(struct inode *inode, pgoff_t idx,
break; break;
idx++; idx++;
num++; num++;
if (num >= max_pages) if (num >= max_pages) {
done = 1;
break; break;
} }
}
pagevec_release(&pvec); pagevec_release(&pvec);
} }
return num; return num;