linux-kernel - Re: [patch 1/4] percpu_ida: make percpu

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-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20131012005227.GB17666@kernel.org>
Date:	Sat, 12 Oct 2013 08:52:27 +0800
From:	Shaohua Li <shli@...nel.org>
To:	Kent Overstreet <kmo@...erainc.com>
Cc:	linux-kernel@...r.kernel.org, axboe@...nel.dk
Subject: Re: [patch 1/4] percpu_ida: make percpu_ida percpu size/batch
 configurable

On Fri, Oct 11, 2013 at 01:31:52PM -0700, Kent Overstreet wrote:
> On Fri, Oct 11, 2013 at 03:18:03PM +0800, Shaohua Li wrote:
> > Make percpu_ida percpu size/batch configurable. The block-mq-tag will use it.
> 
> Can you explain the justification for this? Performance...?

The performance using percpu_ida for tag management? Please see the patch 4
thread.  If you ask the justification of making the size/batch configurable,
the answer is we might have no enough tags, and default cache size/batch is too
aggressive.

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/