Doug / smarc-fsl-linux-kernel

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Commit 77fad5e625e56eb31a343ae1d489979fdc61a2aa

Authored by Nick Piggin
Committed by Jens Axboe
1 parent deed62edff
Exists in master and in 7 other branches imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-l5.0.0_1.0.0-ga

writeback: improve scalability of bdi writeback work queues 

If you're going to do an atomic RMW on each list entry, there's not much
point in all the RCU complexities of the list walking. This is only going
to help the multi-thread case I guess, but it doesn't hurt to do now.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

Showing 1 changed file with 2 additions and 1 deletions Side-by-side Diff

... ... @@ -772,8 +772,9 @@
772 772 rcu_read_lock();
773 773  
774 774 list_for_each_entry_rcu(work, &bdi->work_list, list) {
775   - if (!test_and_clear_bit(wb->nr, &work->seen))
  775 + if (!test_bit(wb->nr, &work->seen))
776 776 continue;
  777 + clear_bit(wb->nr, &work->seen);
777 778  
778 779 ret = work;
779 780 break;