From: Mike Snitzer <snitzer@redhat.com>
To: zhangxiao <xiao.zhang@windriver.com>
Cc: agk@redhat.com, linux-kernel@vger.kernel.org,
NeilBrown <neilb@suse.de>,
linux-raid@vger.kernel.org, dm-devel@redhat.com
Subject: Re: The DM_BUFIO_HASH_BITS is defined as 20, any plan to make it flexible?
Date: Tue, 2 Dec 2014 09:00:17 -0500 [thread overview]
Message-ID: <20141202140015.GB5985@redhat.com> (raw)
In-Reply-To: <547D7BC6.6070708@windriver.com>
On Tue, Dec 02 2014 at 3:43am -0500,
zhangxiao <xiao.zhang@windriver.com> wrote:
> Hi Experts,
>
> See drivers/md/dm-bufio.c as below:
> 50 /*
> 51 * Buffer hash
> 52 */
> 53 #define DM_BUFIO_HASH_BITS 20
> 54 #define DM_BUFIO_HASH(block) \
> 55 ((((block) >> DM_BUFIO_HASH_BITS) ^ (block)) & \
> 56 ((1 << DM_BUFIO_HASH_BITS) - 1))
> "drivers/md/dm-bufio.c" 1854L, 45375C
>
> DM_BUFIO_HASH_BITS was defined as 20 and it maybe not fit for some
> use case with limited resources. Do we have any plan to make it more
> flexible? Like module parameter or something else?
No immediate plans.
next prev parent reply other threads:[~2014-12-02 14:00 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-02 8:43 The DM_BUFIO_HASH_BITS is defined as 20, any plan to make it flexible? zhangxiao
2014-12-02 8:43 ` zhangxiao
2014-12-02 14:00 ` Mike Snitzer [this message]
2014-12-03 14:19 ` [dm-devel] " Joe Thornber
2014-12-03 16:17 ` Mike Snitzer
2014-12-04 1:26 ` [dm-devel] " zhangxiao
2014-12-04 1:26 ` zhangxiao
-- strict thread matches above, loose matches on Subject: below --
2014-12-02 8:32 zhangxiao
2014-12-02 8:32 ` zhangxiao
2014-12-02 8:36 ` NeilBrown
2014-12-02 8:36 ` NeilBrown
2014-12-02 8:40 ` zhangxiao
2014-12-02 8:40 ` zhangxiao
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