From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753285Ab2LDJXo (ORCPT ); Tue, 4 Dec 2012 04:23:44 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:37024 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752369Ab2LDJXj (ORCPT ); Tue, 4 Dec 2012 04:23:39 -0500 X-IronPort-AV: E=Sophos;i="4.83,370,1352044800"; d="scan'208";a="6329947" Message-ID: <50BDC0DE.4010103@cn.fujitsu.com> Date: Tue, 04 Dec 2012 17:22:38 +0800 From: Tang Chen User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1 MIME-Version: 1.0 To: Wen Congyang CC: x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-acpi@vger.kernel.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, linux-ia64@vger.kernel.org, cmetcalf@tilera.com, sparclinux@vger.kernel.org, David Rientjes , Jiang Liu , Len Brown , benh@kernel.crashing.org, paulus@samba.org, Christoph Lameter , Minchan Kim , Andrew Morton , KOSAKI Motohiro , Yasuaki Ishimatsu , Jianguo Wu Subject: Re: [Patch v4 03/12] memory-hotplug: remove redundant codes References: <1354010422-19648-1-git-send-email-wency@cn.fujitsu.com> <1354010422-19648-4-git-send-email-wency@cn.fujitsu.com> In-Reply-To: <1354010422-19648-4-git-send-email-wency@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/12/04 17:22:59, Serialize by Router on mailserver/fnst(Release 8.5.3|September 15, 2011) at 2012/12/04 17:23:00, Serialize complete at 2012/12/04 17:23:00 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/27/2012 06:00 PM, Wen Congyang wrote: > offlining memory blocks and checking whether memory blocks are offlined > are very similar. This patch introduces a new function to remove > redundant codes. > > CC: David Rientjes > CC: Jiang Liu > CC: Len Brown > CC: Christoph Lameter > Cc: Minchan Kim > CC: Andrew Morton > CC: KOSAKI Motohiro > CC: Yasuaki Ishimatsu > Signed-off-by: Wen Congyang Can we merge this patch with [PATCH 03/12] ? Reviewed-by: Tang Chen > --- > mm/memory_hotplug.c | 101 ++++++++++++++++++++++++++++------------------------ > 1 file changed, 55 insertions(+), 46 deletions(-) > > diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c > index b6d1101..6d06488 100644 > --- a/mm/memory_hotplug.c > +++ b/mm/memory_hotplug.c > @@ -1005,20 +1005,14 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages) > return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ); > } > > -int remove_memory(u64 start, u64 size) > +static int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, > + void *arg, int (*func)(struct memory_block *, void *)) > { > struct memory_block *mem = NULL; > struct mem_section *section; > - unsigned long start_pfn, end_pfn; > unsigned long pfn, section_nr; > int ret; > - int return_on_error = 0; > - int retry = 0; > - > - start_pfn = PFN_DOWN(start); > - end_pfn = start_pfn + PFN_DOWN(size); > > -repeat: > for (pfn = start_pfn; pfn< end_pfn; pfn += PAGES_PER_SECTION) { > section_nr = pfn_to_section_nr(pfn); > if (!present_section_nr(section_nr)) > @@ -1035,22 +1029,61 @@ repeat: > if (!mem) > continue; > > - ret = offline_memory_block(mem); > + ret = func(mem, arg); > if (ret) { > - if (return_on_error) { > - kobject_put(&mem->dev.kobj); > - return ret; > - } else { > - retry = 1; > - } > + kobject_put(&mem->dev.kobj); > + return ret; > } > } > > if (mem) > kobject_put(&mem->dev.kobj); > > - if (retry) { > - return_on_error = 1; > + return 0; > +} > + > +static int offline_memory_block_cb(struct memory_block *mem, void *arg) > +{ > + int *ret = arg; > + int error = offline_memory_block(mem); > + > + if (error != 0&& *ret == 0) > + *ret = error; > + > + return 0; > +} > + > +static int is_memblock_offlined_cb(struct memory_block *mem, void *arg) > +{ > + int ret = !is_memblock_offlined(mem); > + > + if (unlikely(ret)) > + pr_warn("removing memory fails, because memory " > + "[%#010llx-%#010llx] is onlined\n", > + PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)), > + PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1); > + > + return ret; > +} > + > +int remove_memory(u64 start, u64 size) > +{ > + unsigned long start_pfn, end_pfn; > + int ret = 0; > + int retry = 1; > + > + start_pfn = PFN_DOWN(start); > + end_pfn = start_pfn + PFN_DOWN(size); > + > +repeat: > + walk_memory_range(start_pfn, end_pfn,&ret, > + offline_memory_block_cb); > + if (ret) { > + if (!retry) > + return ret; > + > + retry = 0; > + ret = 0; > goto repeat; > } > > @@ -1068,37 +1101,13 @@ repeat: > * memory blocks are offlined. > */ > > - for (pfn = start_pfn; pfn< end_pfn; pfn += PAGES_PER_SECTION) { > - section_nr = pfn_to_section_nr(pfn); > - if (!present_section_nr(section_nr)) > - continue; > - > - section = __nr_to_section(section_nr); > - /* same memblock? */ > - if (mem) > - if ((section_nr>= mem->start_section_nr)&& > - (section_nr<= mem->end_section_nr)) > - continue; > - > - mem = find_memory_block_hinted(section, mem); > - if (!mem) > - continue; > - > - ret = is_memblock_offlined(mem); > - if (!ret) { > - pr_warn("removing memory fails, because memory " > - "[%#010llx-%#010llx] is onlined\n", > - PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)), > - PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1)) - 1); > - > - kobject_put(&mem->dev.kobj); > - unlock_memory_hotplug(); > - return ret; > - } > + ret = walk_memory_range(start_pfn, end_pfn, NULL, > + is_memblock_offlined_cb); > + if (ret) { > + unlock_memory_hotplug(); > + return ret; > } > > - if (mem) > - kobject_put(&mem->dev.kobj); > unlock_memory_hotplug(); > > return 0;