Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754082Ab2FKHKN (ORCPT ); Mon, 11 Jun 2012 03:10:13 -0400 Received: from fgwmail6.fujitsu.co.jp ([192.51.44.36]:48324 "EHLO fgwmail6.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751483Ab2FKHKL (ORCPT ); Mon, 11 Jun 2012 03:10:11 -0400 X-SecurityPolicyCheck: OK by SHieldMailChecker v1.7.4 Message-ID: <4FD59952.7020602@jp.fujitsu.com> Date: Mon, 11 Jun 2012 16:08:02 +0900 From: Kamezawa Hiroyuki User-Agent: Mozilla/5.0 (Windows NT 6.0; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: Minchan Kim CC: Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Mel Gorman , Michal Hocko Subject: Re: [PATCH] mm: clean up __count_immobile_pages References: <1339380442-1137-1-git-send-email-minchan@kernel.org> In-Reply-To: <1339380442-1137-1-git-send-email-minchan@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3542 Lines: 104 (2012/06/11 11:07), Minchan Kim wrote: > __count_immobile_pages naming is rather awkward. > This patch clean up the function and add comment. > > Cc: Mel Gorman > Cc: Michal Hocko > Cc: KAMEZAWA Hiroyuki > Signed-off-by: Minchan Kim exchange true<->false caused by renaming ? Acked-by: KAMEZAWA Hiroyuki > --- > mm/page_alloc.c | 33 +++++++++++++++++---------------- > 1 file changed, 17 insertions(+), 16 deletions(-) > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 019c4fe..2c71ac9 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -5467,26 +5467,27 @@ void set_pageblock_flags_group(struct page *page, unsigned long flags, > } > > /* > - * This is designed as sub function...plz see page_isolation.c also. > - * set/clear page block's type to be ISOLATE. > - * page allocater never alloc memory from ISOLATE block. > + * This function checks whether pageblock includes unmovable pages or not. > + * If @count is not zero, it is okay to include less @count unmovable pages > + * > + * This function can race in PageLRU and MIGRATE_MOVABLE can have unmovable > + * pages so that it might be not exact. > */ > - > -static int > -__count_immobile_pages(struct zone *zone, struct page *page, int count) > +static bool > +__has_unmovable_pages(struct zone *zone, struct page *page, int count) > { > unsigned long pfn, iter, found; > int mt; > > /* > * For avoiding noise data, lru_add_drain_all() should be called > - * If ZONE_MOVABLE, the zone never contains immobile pages > + * If ZONE_MOVABLE, the zone never contains unmovable pages > */ > if (zone_idx(zone) == ZONE_MOVABLE) > - return true; > + return false; > mt = get_pageblock_migratetype(page); > if (mt == MIGRATE_MOVABLE || is_migrate_cma(mt)) > - return true; > + return false; > > pfn = page_to_pfn(page); > for (found = 0, iter = 0; iter< pageblock_nr_pages; iter++) { > @@ -5521,9 +5522,9 @@ __count_immobile_pages(struct zone *zone, struct page *page, int count) > * page at boot. > */ > if (found> count) > - return false; > + return true; > } > - return true; > + return false; > } > > bool is_pageblock_removable_nolock(struct page *page) > @@ -5547,7 +5548,7 @@ bool is_pageblock_removable_nolock(struct page *page) > zone->zone_start_pfn + zone->spanned_pages<= pfn) > return false; > > - return __count_immobile_pages(zone, page, 0); > + return !__has_unmovable_pages(zone, page, 0); > } > > int set_migratetype_isolate(struct page *page) > @@ -5586,12 +5587,12 @@ int set_migratetype_isolate(struct page *page) > * FIXME: Now, memory hotplug doesn't call shrink_slab() by itself. > * We just check MOVABLE pages. > */ > - if (__count_immobile_pages(zone, page, arg.pages_found)) > + if (!__has_unmovable_pages(zone, page, arg.pages_found)) > ret = 0; > - > /* > - * immobile means "not-on-lru" paes. If immobile is larger than > - * removable-by-driver pages reported by notifier, we'll fail. > + * Unmovable means "not-on-lru" pages. If Unmovable pages are > + * larger than removable-by-driver pages reported by notifier, > + * we'll fail. > */ > > out: -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/