From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> To: Andrew Morton <akpm@linux-foundation.org>, Hugh Dickins <hughd@google.com> Cc: Andrea Arcangeli <aarcange@redhat.com>, Dave Hansen <dave.hansen@intel.com>, Vlastimil Babka <vbabka@suse.cz>, Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.cz>, David Rientjes <rientjes@google.com>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Subject: [PATCHv5 3/7] zsmalloc: use page->private instead of page->first_page Date: Thu, 3 Sep 2015 15:35:54 +0300 [thread overview] Message-ID: <1441283758-92774-4-git-send-email-kirill.shutemov@linux.intel.com> (raw) In-Reply-To: <1441283758-92774-1-git-send-email-kirill.shutemov@linux.intel.com> We are going to rework how compound_head() work. It will not use page->first_page as we have it now. The only other user of page->first_page beyond compound pages is zsmalloc. Let's use page->private instead of page->first_page here. It occupies the same storage space. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> --- mm/zsmalloc.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index 0a7f81aa2249..6a092de6b636 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -16,7 +16,7 @@ * struct page(s) to form a zspage. * * Usage of struct page fields: - * page->first_page: points to the first component (0-order) page + * page->private: points to the first component (0-order) page * page->index (union with page->freelist): offset of the first object * starting in this page. For the first page, this is * always 0, so we use this field (aka freelist) to point @@ -26,8 +26,7 @@ * * For _first_ page only: * - * page->private (union with page->first_page): refers to the - * component page after the first page + * page->private: refers to the component page after the first page * If the page is first_page for huge object, it stores handle. * Look at size_class->huge. * page->freelist: points to the first free object in zspage. @@ -770,7 +769,7 @@ static struct page *get_first_page(struct page *page) if (is_first_page(page)) return page; else - return page->first_page; + return (struct page *)page_private(page); } static struct page *get_next_page(struct page *page) @@ -955,7 +954,7 @@ static struct page *alloc_zspage(struct size_class *class, gfp_t flags) * Allocate individual pages and link them together as: * 1. first page->private = first sub-page * 2. all sub-pages are linked together using page->lru - * 3. each sub-page is linked to the first page using page->first_page + * 3. each sub-page is linked to the first page using page->private * * For each size class, First/Head pages are linked together using * page->lru. Also, we set PG_private to identify the first page @@ -980,7 +979,7 @@ static struct page *alloc_zspage(struct size_class *class, gfp_t flags) if (i == 1) set_page_private(first_page, (unsigned long)page); if (i >= 1) - page->first_page = first_page; + set_page_private(page, (unsigned long)first_page); if (i >= 2) list_add(&page->lru, &prev_page->lru); if (i == class->pages_per_zspage - 1) /* last page */ -- 2.5.0
WARNING: multiple messages have this Message-ID (diff)
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> To: Andrew Morton <akpm@linux-foundation.org>, Hugh Dickins <hughd@google.com> Cc: Andrea Arcangeli <aarcange@redhat.com>, Dave Hansen <dave.hansen@intel.com>, Vlastimil Babka <vbabka@suse.cz>, Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.cz>, David Rientjes <rientjes@google.com>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Subject: [PATCHv5 3/7] zsmalloc: use page->private instead of page->first_page Date: Thu, 3 Sep 2015 15:35:54 +0300 [thread overview] Message-ID: <1441283758-92774-4-git-send-email-kirill.shutemov@linux.intel.com> (raw) In-Reply-To: <1441283758-92774-1-git-send-email-kirill.shutemov@linux.intel.com> We are going to rework how compound_head() work. It will not use page->first_page as we have it now. The only other user of page->first_page beyond compound pages is zsmalloc. Let's use page->private instead of page->first_page here. It occupies the same storage space. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> --- mm/zsmalloc.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index 0a7f81aa2249..6a092de6b636 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -16,7 +16,7 @@ * struct page(s) to form a zspage. * * Usage of struct page fields: - * page->first_page: points to the first component (0-order) page + * page->private: points to the first component (0-order) page * page->index (union with page->freelist): offset of the first object * starting in this page. For the first page, this is * always 0, so we use this field (aka freelist) to point @@ -26,8 +26,7 @@ * * For _first_ page only: * - * page->private (union with page->first_page): refers to the - * component page after the first page + * page->private: refers to the component page after the first page * If the page is first_page for huge object, it stores handle. * Look at size_class->huge. * page->freelist: points to the first free object in zspage. @@ -770,7 +769,7 @@ static struct page *get_first_page(struct page *page) if (is_first_page(page)) return page; else - return page->first_page; + return (struct page *)page_private(page); } static struct page *get_next_page(struct page *page) @@ -955,7 +954,7 @@ static struct page *alloc_zspage(struct size_class *class, gfp_t flags) * Allocate individual pages and link them together as: * 1. first page->private = first sub-page * 2. all sub-pages are linked together using page->lru - * 3. each sub-page is linked to the first page using page->first_page + * 3. each sub-page is linked to the first page using page->private * * For each size class, First/Head pages are linked together using * page->lru. Also, we set PG_private to identify the first page @@ -980,7 +979,7 @@ static struct page *alloc_zspage(struct size_class *class, gfp_t flags) if (i == 1) set_page_private(first_page, (unsigned long)page); if (i >= 1) - page->first_page = first_page; + set_page_private(page, (unsigned long)first_page); if (i >= 2) list_add(&page->lru, &prev_page->lru); if (i == class->pages_per_zspage - 1) /* last page */ -- 2.5.0 -- 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: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2015-09-03 12:36 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-09-03 12:35 [PATCHv5 0/7] Fix compound_head() race Kirill A. Shutemov 2015-09-03 12:35 ` Kirill A. Shutemov 2015-09-03 12:35 ` [PATCHv5 1/7] mm: drop page->slab_page Kirill A. Shutemov 2015-09-03 12:35 ` Kirill A. Shutemov 2015-09-07 5:00 ` Alexander Duyck 2015-09-07 5:00 ` Alexander Duyck 2015-09-07 12:19 ` Kirill A. Shutemov 2015-09-07 12:19 ` Kirill A. Shutemov 2015-09-03 12:35 ` [PATCHv5 2/7] slub: use page->rcu_head instead of page->lru plus cast Kirill A. Shutemov 2015-09-03 12:35 ` Kirill A. Shutemov 2015-09-03 12:35 ` Kirill A. Shutemov [this message] 2015-09-03 12:35 ` [PATCHv5 3/7] zsmalloc: use page->private instead of page->first_page Kirill A. Shutemov 2015-09-03 12:35 ` [PATCHv5 4/7] mm: pack compound_dtor and compound_order into one word in struct page Kirill A. Shutemov 2015-09-03 12:35 ` Kirill A. Shutemov 2015-09-10 9:41 ` Vlastimil Babka 2015-09-10 9:41 ` Vlastimil Babka 2015-09-03 12:35 ` [PATCHv5 5/7] mm: make compound_head() robust Kirill A. Shutemov 2015-09-03 12:35 ` Kirill A. Shutemov 2015-09-10 10:54 ` Vlastimil Babka 2015-09-10 10:54 ` Vlastimil Babka 2015-09-11 13:35 ` Kirill A. Shutemov 2015-09-11 13:35 ` Kirill A. Shutemov 2015-09-14 13:31 ` Vlastimil Babka 2015-09-14 13:31 ` Vlastimil Babka 2015-09-03 12:35 ` [PATCHv5 6/7] mm: use 'unsigned int' for page order Kirill A. Shutemov 2015-09-03 12:35 ` Kirill A. Shutemov 2015-09-10 11:04 ` Vlastimil Babka 2015-09-10 11:04 ` Vlastimil Babka 2015-09-03 12:35 ` [PATCHv5 7/7] mm: use 'unsigned int' for compound_dtor/compound_order on 64BIT Kirill A. Shutemov 2015-09-03 12:35 ` Kirill A. Shutemov 2015-09-10 11:34 ` Vlastimil Babka 2015-09-10 11:34 ` Vlastimil Babka 2015-09-04 13:43 ` [PATCHv5 0/7] Fix compound_head() race Andrea Arcangeli 2015-09-04 13:43 ` Andrea Arcangeli
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