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Date: Thu, 4 Dec 2014 09:26:19 +0800 From: zhangxiao <xiao.zhang@...driver.com> To: device-mapper development <dm-devel@...hat.com>, <linux-raid@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <agk@...hat.com> Subject: Re: [dm-devel] The DM_BUFIO_HASH_BITS is defined as 20, any plan to make it flexible? On 2014年12月03日 22:19, Joe Thornber wrote: > On Tue, Dec 02, 2014 at 09:00:17AM -0500, Mike Snitzer wrote: >> On Tue, Dec 02 2014 at 3:43am -0500, >> zhangxiao <xiao.zhang@...driver.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. > > That hash table has been replaced with a red/black tree. > > https://git.kernel.org/cgit/linux/kernel/git/device-mapper/linux-dm.git/commit/?h=dm-for-3.19&id=4e420c452b11edf9d510c8180ac66f529e5b6206 > > Great Thanks! Best Regards Xiao -- 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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