From: Gao Xiang <gaoxiang25@huawei.com> To: Alexander Viro <viro@zeniv.linux.org.uk>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Andrew Morton <akpm@linux-foundation.org>, Stephen Rothwell <sfr@canb.auug.org.au>, Theodore Ts'o <tytso@mit.edu>, "David Sterba" <dsterba@suse.cz>, Amir Goldstein <amir73il@gmail.com>, Linus Torvalds <torvalds@linux-foundation.org> Cc: <linux-fsdevel@vger.kernel.org>, <devel@driverdev.osuosl.org>, LKML <linux-kernel@vger.kernel.org>, <linux-erofs@lists.ozlabs.org>, Chao Yu <yuchao0@huawei.com>, Miao Xie <miaoxie@huawei.com>, Li Guifu <bluce.liguifu@huawei.com>, Fang Wei <fangwei1@huawei.com>, Gao Xiang <gaoxiang25@huawei.com> Subject: [PATCH v4 19/24] erofs: add erofs_allocpage() Date: Thu, 25 Jul 2019 17:56:53 +0800 [thread overview] Message-ID: <20190725095658.155779-20-gaoxiang25@huawei.com> (raw) In-Reply-To: <20190725095658.155779-1-gaoxiang25@huawei.com> This patch introduces an temporary _on-stack_ page pool to reuse the freed page directly as much as it can for better performance and release all pages at a time, it also slightly reduces the possibility of the potential memory allocation failure. Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> --- fs/erofs/internal.h | 2 ++ fs/erofs/utils.c | 14 ++++++++++++++ 2 files changed, 16 insertions(+) diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index 410e1b7ef82e..d450ab130d5e 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -492,6 +492,8 @@ int erofs_namei(struct inode *dir, struct qstr *name, extern const struct file_operations erofs_dir_fops; /* utils.c */ +struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp, bool nofail); + #if (EROFS_PCPUBUF_NR_PAGES > 0) void *erofs_get_pcpubuf(unsigned int pagenr); #define erofs_put_pcpubuf(buf) do { \ diff --git a/fs/erofs/utils.c b/fs/erofs/utils.c index ffaa226746b8..34d0aad1af83 100644 --- a/fs/erofs/utils.c +++ b/fs/erofs/utils.c @@ -9,6 +9,20 @@ #include "internal.h" #include <linux/pagevec.h> +struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp, bool nofail) +{ + struct page *page; + + if (!list_empty(pool)) { + page = lru_to_page(pool); + DBG_BUGON(page_ref_count(page) != 1); + list_del(&page->lru); + } else { + page = alloc_pages(gfp | (nofail ? __GFP_NOFAIL : 0), 0); + } + return page; +} + #if (EROFS_PCPUBUF_NR_PAGES > 0) static struct { u8 data[PAGE_SIZE * EROFS_PCPUBUF_NR_PAGES]; -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: gaoxiang25@huawei.com (Gao Xiang) Subject: [PATCH v4 19/24] erofs: add erofs_allocpage() Date: Thu, 25 Jul 2019 17:56:53 +0800 [thread overview] Message-ID: <20190725095658.155779-20-gaoxiang25@huawei.com> (raw) In-Reply-To: <20190725095658.155779-1-gaoxiang25@huawei.com> This patch introduces an temporary _on-stack_ page pool to reuse the freed page directly as much as it can for better performance and release all pages at a time, it also slightly reduces the possibility of the potential memory allocation failure. Signed-off-by: Gao Xiang <gaoxiang25 at huawei.com> --- fs/erofs/internal.h | 2 ++ fs/erofs/utils.c | 14 ++++++++++++++ 2 files changed, 16 insertions(+) diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index 410e1b7ef82e..d450ab130d5e 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -492,6 +492,8 @@ int erofs_namei(struct inode *dir, struct qstr *name, extern const struct file_operations erofs_dir_fops; /* utils.c */ +struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp, bool nofail); + #if (EROFS_PCPUBUF_NR_PAGES > 0) void *erofs_get_pcpubuf(unsigned int pagenr); #define erofs_put_pcpubuf(buf) do { \ diff --git a/fs/erofs/utils.c b/fs/erofs/utils.c index ffaa226746b8..34d0aad1af83 100644 --- a/fs/erofs/utils.c +++ b/fs/erofs/utils.c @@ -9,6 +9,20 @@ #include "internal.h" #include <linux/pagevec.h> +struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp, bool nofail) +{ + struct page *page; + + if (!list_empty(pool)) { + page = lru_to_page(pool); + DBG_BUGON(page_ref_count(page) != 1); + list_del(&page->lru); + } else { + page = alloc_pages(gfp | (nofail ? __GFP_NOFAIL : 0), 0); + } + return page; +} + #if (EROFS_PCPUBUF_NR_PAGES > 0) static struct { u8 data[PAGE_SIZE * EROFS_PCPUBUF_NR_PAGES]; -- 2.17.1
next prev parent reply other threads:[~2019-07-25 9:58 UTC|newest] Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-07-25 9:56 [PATCH v4 00/24] erofs: promote erofs from staging Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 01/24] erofs: add on-disk layout Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 02/24] erofs: add erofs in-memory stuffs Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 03/24] erofs: add super block operations Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 04/24] erofs: add raw address_space operations Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 05/24] erofs: add inode operations Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 06/24] erofs: support special inode Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 07/24] erofs: add directory operations Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 08/24] erofs: add namei functions Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 09/24] erofs: support tracepoint Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 10/24] erofs: update Kconfig and Makefile Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 11/24] erofs: introduce xattr & posixacl support Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 12/24] erofs: introduce tagged pointer Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 13/24] erofs: add compression indexes support Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 14/24] erofs: introduce superblock registration Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 15/24] erofs: introduce erofs shrinker Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 16/24] erofs: introduce workstation for decompression Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 17/24] erofs: introduce per-CPU buffers implementation Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 18/24] erofs: introduce pagevec for decompression subsystem Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` Gao Xiang [this message] 2019-07-25 9:56 ` [PATCH v4 19/24] erofs: add erofs_allocpage() Gao Xiang 2019-07-25 9:56 ` [PATCH v4 20/24] erofs: introduce generic decompression backend Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 21/24] erofs: introduce LZ4 decompression inplace Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 22/24] erofs: introduce the decompression frontend Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 23/24] erofs: introduce cached decompression Gao Xiang 2019-07-25 9:56 ` Gao Xiang 2019-07-25 9:56 ` [PATCH v4 24/24] erofs: add document Gao Xiang 2019-07-25 9:56 ` Gao Xiang
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