lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <20131011071802.148101321@kernel.org>
Date:	Fri, 11 Oct 2013 15:18:02 +0800
From:	Shaohua Li <shli@...nel.org>
To:	linux-kernel@...r.kernel.org, axboe@...nel.dk
Cc:	kmo@...erainc.com
Subject: [patch 0/4] 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.

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/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ