From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx188.postini.com [74.125.245.188]) by kanga.kvack.org (Postfix) with SMTP id 6EE6F6B0036 for ; Tue, 6 Aug 2013 02:43:12 -0400 (EDT) Received: from eucpsbgm1.samsung.com (unknown [203.254.199.244]) by mailout3.w1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0MR300EBZJZ5FG30@mailout3.w1.samsung.com> for linux-mm@kvack.org; Tue, 06 Aug 2013 07:43:10 +0100 (BST) From: Krzysztof Kozlowski Subject: [RFC PATCH 3/4] mm: add zbud flag to page flags Date: Tue, 06 Aug 2013 08:42:40 +0200 Message-id: <1375771361-8388-4-git-send-email-k.kozlowski@samsung.com> In-reply-to: <1375771361-8388-1-git-send-email-k.kozlowski@samsung.com> References: <1375771361-8388-1-git-send-email-k.kozlowski@samsung.com> Sender: owner-linux-mm@kvack.org List-ID: To: Seth Jennings , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton Cc: Mel Gorman , Bartlomiej Zolnierkiewicz , Marek Szyprowski , Kyungmin Park , Krzysztof Kozlowski Add PageZbud flag to page flags to distinguish pages allocated in zbud. Currently these pages do not have any flags set. Signed-off-by: Krzysztof Kozlowski --- include/linux/page-flags.h | 12 ++++++++++++ mm/page_alloc.c | 3 +++ mm/zbud.c | 4 ++++ 3 files changed, 19 insertions(+) diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 6d53675..5b8b61a6 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -109,6 +109,12 @@ enum pageflags { #ifdef CONFIG_TRANSPARENT_HUGEPAGE PG_compound_lock, #endif +#ifdef CONFIG_ZBUD + /* Allocated by zbud. Flag is necessary to find zbud pages to unuse + * during migration/compaction. + */ + PG_zbud, +#endif __NR_PAGEFLAGS, /* Filesystems */ @@ -275,6 +281,12 @@ PAGEFLAG_FALSE(HWPoison) #define __PG_HWPOISON 0 #endif +#ifdef CONFIG_ZBUD +PAGEFLAG(Zbud, zbud) +#else +PAGEFLAG_FALSE(Zbud) +#endif + u64 stable_page_flags(struct page *page); static inline int PageUptodate(struct page *page) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index b100255..1a120fb 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -6345,6 +6345,9 @@ static const struct trace_print_flags pageflag_names[] = { #ifdef CONFIG_TRANSPARENT_HUGEPAGE {1UL << PG_compound_lock, "compound_lock" }, #endif +#ifdef CONFIG_ZBUD + {1UL << PG_zbud, "zbud" }, +#endif }; static void dump_page_flags(unsigned long flags) diff --git a/mm/zbud.c b/mm/zbud.c index a8e986f..a452949 100644 --- a/mm/zbud.c +++ b/mm/zbud.c @@ -230,7 +230,10 @@ static void get_zbud_page(struct zbud_header *zhdr) static int put_zbud_page(struct zbud_pool *pool, struct zbud_header *zhdr) { struct page *page = virt_to_page(zhdr); + BUG_ON(!PageZbud(page)); + if (put_page_testzero(page)) { + ClearPageZbud(page); free_hot_cold_page(page, 0); pool->pages_nr--; return 1; @@ -341,6 +344,7 @@ int zbud_alloc(struct zbud_pool *pool, int size, gfp_t gfp, * don't increase the page count. */ zhdr = init_zbud_page(page); + SetPageZbud(page); bud = FIRST; found: -- 1.7.9.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org