diff options
| author | Gao Xiang <gaoxiang25@huawei.com> | 2018-07-26 20:21:59 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-27 17:24:08 +0200 |
| commit | b29e64d8798018c3e82a426ec34b39b825ac68dc (patch) | |
| tree | 3dfecc4d2b2bb5a72bbe31659b4ea65f2385ddab /drivers | |
| parent | 02827e1796b33f1794966f5c3101f8da2dfa9c1d (diff) | |
staging: erofs: add erofs_allocpage
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/erofs/Makefile | 2 | ||||
| -rw-r--r-- | drivers/staging/erofs/internal.h | 7 | ||||
| -rw-r--r-- | drivers/staging/erofs/utils.c | 31 |
3 files changed, 39 insertions, 1 deletions
diff --git a/drivers/staging/erofs/Makefile b/drivers/staging/erofs/Makefile index 8558c761a74b..490fa6cced08 100644 --- a/drivers/staging/erofs/Makefile +++ b/drivers/staging/erofs/Makefile @@ -7,7 +7,7 @@ ccflags-y += -Wall -DEROFS_VERSION=\"$(EROFS_VERSION)\" obj-$(CONFIG_EROFS_FS) += erofs.o # staging requirement: to be self-contained in its own directory ccflags-y += -I$(src)/include -erofs-objs := super.o inode.o data.o namei.o dir.o +erofs-objs := super.o inode.o data.o namei.o dir.o utils.o erofs-$(CONFIG_EROFS_FS_XATTR) += xattr.o erofs-$(CONFIG_EROFS_FS_ZIP) += unzip_vle.o diff --git a/drivers/staging/erofs/internal.h b/drivers/staging/erofs/internal.h index bea5ec458707..210ab6c64df8 100644 --- a/drivers/staging/erofs/internal.h +++ b/drivers/staging/erofs/internal.h @@ -369,5 +369,12 @@ static inline void erofs_vunmap(const void *mem, unsigned int count) #endif } +/* utils.c */ +extern struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp); + +#ifndef lru_to_page +#define lru_to_page(head) (list_entry((head)->prev, struct page, lru)) +#endif + #endif diff --git a/drivers/staging/erofs/utils.c b/drivers/staging/erofs/utils.c new file mode 100644 index 000000000000..3dec4f80ed99 --- /dev/null +++ b/drivers/staging/erofs/utils.c @@ -0,0 +1,31 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/drivers/staging/erofs/utils.c + * + * Copyright (C) 2018 HUAWEI, Inc. + * http://www.huawei.com/ + * Created by Gao Xiang <gaoxiang25@huawei.com> + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of the Linux + * distribution for more details. + */ + +#include "internal.h" + +struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp) +{ + struct page *page; + + if (!list_empty(pool)) { + page = lru_to_page(pool); + list_del(&page->lru); + } else { + page = alloc_pages(gfp | __GFP_NOFAIL, 0); + + BUG_ON(page == NULL); + BUG_ON(page->mapping != NULL); + } + return page; +} + |