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Message-ID: <20190725095658.155779-20-gaoxiang25@huawei.com>
Date: Thu, 25 Jul 2019 17:56:53 +0800
From: Gao Xiang <gaoxiang25@...wei.com>
To: Alexander Viro <viro@...iv.linux.org.uk>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Stephen Rothwell <sfr@...b.auug.org.au>,
Theodore Ts'o <tytso@....edu>,
"David Sterba" <dsterba@...e.cz>,
Amir Goldstein <amir73il@...il.com>,
Linus Torvalds <torvalds@...ux-foundation.org>
CC: <linux-fsdevel@...r.kernel.org>, <devel@...verdev.osuosl.org>,
LKML <linux-kernel@...r.kernel.org>,
<linux-erofs@...ts.ozlabs.org>, Chao Yu <yuchao0@...wei.com>,
Miao Xie <miaoxie@...wei.com>,
Li Guifu <bluce.liguifu@...wei.com>,
Fang Wei <fangwei1@...wei.com>,
Gao Xiang <gaoxiang25@...wei.com>
Subject: [PATCH v4 19/24] 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@...wei.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
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