dm cache: optimize dirty bit checking with find_next_bit when resizing

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commit f484697e61 upstream.

When shrinking the fast device, dm-cache iteratively searches for a
dirty bit among the cache blocks to be dropped, which is less efficient.
Use find_next_bit instead, as it is twice as fast as the iterative
approach with test_bit.

Signed-off-by: Ming-Hung Tsai <mtsai@redhat.com>
Fixes: f494a9c6b1 ("dm cache: cache shrinking support")
Cc: stable@vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Acked-by: Joe Thornber <thornber@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Ming-Hung Tsai 2024-10-22 15:13:39 +08:00 • committed by Greg Kroah-Hartman

parent ff1dd8a04c

commit 01c4e15a45

1 changed files with 8 additions and 8 deletions

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drivers/md/dm-cache-target.c

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