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
| ||
|
Date: Tue, 09 Apr 2013 13:42:50 +0800 From: Simon Jeons <simon.jeons@...il.com> To: Cody P Schafer <cody@...ux.vnet.ibm.com> CC: Andrew Morton <akpm@...ux-foundation.org>, Mel Gorman <mgorman@...e.de>, Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 1/3] mm/page_alloc: factor out setting of pcp->high and pcp->batch. Hi Cody, On 04/09/2013 01:39 AM, Cody P Schafer wrote: > On 04/06/2013 06:37 PM, Simon Jeons wrote: >> Hi Cody, >> On 04/06/2013 04:33 AM, Cody P Schafer wrote: >>> Creates pageset_set_batch() for use in setup_pageset(). >>> pageset_set_batch() imitates the functionality of >>> setup_pagelist_highmark(), but uses the boot time >>> (percpu_pagelist_fraction == 0) calculations for determining ->high >> >> Why need adjust pcp->high, pcp->batch during system running? What's the >> requirement? >> > > There is currently a sysctl (which I patch later in this series) which > allows adjusting the ->high mark (and, indirectly, ->batch). > Additionally, memory hotplug changes ->high and ->batch due to the > zone size changing (essentially, zone->managed_pages and > zone->present_pages have changed) , meaning that zone_batchsize(), > which is used at boot to set ->batch and (indirectly) ->high has a > different output. Thanks for your explain. I'm curious about this sysctl, when need adjust the ->high, ->batch during system running except memory hotplug which will change zone size? > > Note that in addition to the 2 users of this functionality mentioned > here, I'm currently working on anther resizer of zones (runtime NUMA > reconfiguration). > -- 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