From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx168.postini.com [74.125.245.168]) by kanga.kvack.org (Postfix) with SMTP id F1D966B0081 for ; Wed, 13 Jun 2012 06:28:49 -0400 (EDT) Received: from /spool/local by e28smtp08.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 13 Jun 2012 15:58:46 +0530 Received: from d28av01.in.ibm.com (d28av01.in.ibm.com [9.184.220.63]) by d28relay05.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q5DASEg960293202 for ; Wed, 13 Jun 2012 15:58:14 +0530 Received: from d28av01.in.ibm.com (loopback [127.0.0.1]) by d28av01.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q5DFvkNu001320 for ; Wed, 13 Jun 2012 21:27:49 +0530 From: "Aneesh Kumar K.V" Subject: [PATCH -V9 06/15] hugetlb: simplify migrate_huge_page() Date: Wed, 13 Jun 2012 15:57:25 +0530 Message-Id: <1339583254-895-7-git-send-email-aneesh.kumar@linux.vnet.ibm.com> In-Reply-To: <1339583254-895-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> References: <1339583254-895-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org, kamezawa.hiroyu@jp.fujitsu.com, dhillf@gmail.com, rientjes@google.com, mhocko@suse.cz, akpm@linux-foundation.org, hannes@cmpxchg.org Cc: linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, "Aneesh Kumar K.V" From: "Aneesh Kumar K.V" Since we migrate only one hugepage, don't use linked list for passing the page around. Directly pass the page that need to be migrated as argument. This also remove the usage page->lru in migrate path. Reviewed-by: KAMEZAWA Hiroyuki Signed-off-by: Aneesh Kumar K.V --- include/linux/migrate.h | 4 +-- mm/memory-failure.c | 13 ++-------- mm/migrate.c | 65 +++++++++++++++-------------------------------- 3 files changed, 25 insertions(+), 57 deletions(-) diff --git a/include/linux/migrate.h b/include/linux/migrate.h index 855c337..ce7e667 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -15,7 +15,7 @@ extern int migrate_page(struct address_space *, extern int migrate_pages(struct list_head *l, new_page_t x, unsigned long private, bool offlining, enum migrate_mode mode); -extern int migrate_huge_pages(struct list_head *l, new_page_t x, +extern int migrate_huge_page(struct page *, new_page_t x, unsigned long private, bool offlining, enum migrate_mode mode); @@ -36,7 +36,7 @@ static inline void putback_lru_pages(struct list_head *l) {} static inline int migrate_pages(struct list_head *l, new_page_t x, unsigned long private, bool offlining, enum migrate_mode mode) { return -ENOSYS; } -static inline int migrate_huge_pages(struct list_head *l, new_page_t x, +static inline int migrate_huge_page(struct page *page, new_page_t x, unsigned long private, bool offlining, enum migrate_mode mode) { return -ENOSYS; } diff --git a/mm/memory-failure.c b/mm/memory-failure.c index ab1e714..53a1495 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1414,7 +1414,6 @@ static int soft_offline_huge_page(struct page *page, int flags) int ret; unsigned long pfn = page_to_pfn(page); struct page *hpage = compound_head(page); - LIST_HEAD(pagelist); ret = get_any_page(page, pfn, flags); if (ret < 0) @@ -1429,19 +1428,11 @@ static int soft_offline_huge_page(struct page *page, int flags) } /* Keep page count to indicate a given hugepage is isolated. */ - - list_add(&hpage->lru, &pagelist); - ret = migrate_huge_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL, 0, - true); + ret = migrate_huge_page(hpage, new_page, MPOL_MF_MOVE_ALL, 0, true); + put_page(hpage); if (ret) { - struct page *page1, *page2; - list_for_each_entry_safe(page1, page2, &pagelist, lru) - put_page(page1); - pr_info("soft offline: %#lx: migration failed %d, type %lx\n", pfn, ret, page->flags); - if (ret > 0) - ret = -EIO; return ret; } done: diff --git a/mm/migrate.c b/mm/migrate.c index be26d5c..fdce3a2 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -932,15 +932,8 @@ static int unmap_and_move_huge_page(new_page_t get_new_page, if (anon_vma) put_anon_vma(anon_vma); unlock_page(hpage); - out: - if (rc != -EAGAIN) { - list_del(&hpage->lru); - put_page(hpage); - } - put_page(new_hpage); - if (result) { if (rc) *result = rc; @@ -1016,48 +1009,32 @@ out: return nr_failed + retry; } -int migrate_huge_pages(struct list_head *from, - new_page_t get_new_page, unsigned long private, bool offlining, - enum migrate_mode mode) +int migrate_huge_page(struct page *hpage, new_page_t get_new_page, + unsigned long private, bool offlining, + enum migrate_mode mode) { - int retry = 1; - int nr_failed = 0; - int pass = 0; - struct page *page; - struct page *page2; - int rc; - - for (pass = 0; pass < 10 && retry; pass++) { - retry = 0; - - list_for_each_entry_safe(page, page2, from, lru) { + int pass, rc; + + for (pass = 0; pass < 10; pass++) { + rc = unmap_and_move_huge_page(get_new_page, + private, hpage, pass > 2, offlining, + mode); + switch (rc) { + case -ENOMEM: + goto out; + case -EAGAIN: + /* try again */ cond_resched(); - - rc = unmap_and_move_huge_page(get_new_page, - private, page, pass > 2, offlining, - mode); - - switch(rc) { - case -ENOMEM: - goto out; - case -EAGAIN: - retry++; - break; - case 0: - break; - default: - /* Permanent failure */ - nr_failed++; - break; - } + break; + case 0: + goto out; + default: + rc = -EIO; + goto out; } } - rc = 0; out: - if (rc) - return rc; - - return nr_failed + retry; + return rc; } #ifdef CONFIG_NUMA -- 1.7.10 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. 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