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Date: Tue, 15 Oct 2013 09:05:00 +0800 From: Shaohua Li <shli@...nel.org> To: linux-kernel@...r.kernel.org, axboe@...nel.dk Cc: kmo@...erainc.com Subject: [patch 0/4 v2] blk-mq: use percpu_ida to manage tags Hi, blk-mq and percpu_ida use similar algorithm to manage tags. The difference is when a cpu can't allocate tags, blk-mq will use ipi to purge remote cpu cache, while percpu-ida directly purges remote cpu cache. In practice, the percpu-ida approach is much faster when we can't allocate enough for percpu cache. This patch makes blk-mq use percpu_ida to manage tags, this avoids some duplicate code and has better performance as I mentioned. To test the patches, rebase blk-mq tree to latest kernel first. The v2 patch updated some log descriptions, fixed one issue Kent pointed out and added performance data. Thanks, Shaohua -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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