Commits
Pavel Tikhomirov authored and Konstantin Khorenko committed 8632b85239d
x86/asm: remove the unused get_limit() method https://jira.sw.ru/browse/PSBM-96243 (inspired by commit 72d64cc76941cde45e65e2a5b9fb81d527963645) To fix compilation of ("blk-wbt: add general throttling mechanism") Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com> ===================== Patchset description: block: backport writeback throttling We have a problem that if we run heavy write load on one cpu simultaneousely with short direct reads on other cpu, the latter will hang significantly. Writeback throttling looks like a sollution for these reads, as it will decrease the priority of long running writeback. Running simple dd experiment we see that reads latency decreased after wbt patches applied: https://docs.google.com/spreadsheets/d/1HLtepwFL_N5zm0JcTqMtJoYnf-b6Slwld8DDgL0gNDI We've ran vconsolidate on custom kernel with these patches, though it does not show any performance improvement (likely because this test does not produce high rate of writeback), it does not crash or fail the test. https://jira.sw.ru/browse/PSBM-96243 Jens Axboe (6): block: add REQ_BACKGROUND writeback: add wbc_to_write_flags() writeback: mark background writeback as such writeback: track if we're sleeping on progress in balance_dirty_pages() blk-wbt: add general throttling mechanism block: hook up writeback throttling Omar Sandoval (1): block: get rid of struct blk_issue_stat Pavel Tikhomirov (2): x86/asm: remove the unused get_limit() method block: enable CONFIG_BLK_WBT* blk-wbt: increase maximum queue depth to increase performance of writes