f2fs: use vmalloc instead of kvmalloc in .init_{,de}compress_ctx

[ Upstream commit 70dd07c888451503c3e93b6821e10d1ea1ec9930 ]

.init_{,de}compress_ctx uses kvmalloc() to alloc memory, it will try
to allocate physically continuous page first, it may cause more memory
allocation pressure, let's use vmalloc instead to mitigate it.

[Test]
cd /data/local/tmp
touch file
f2fs_io setflags compression file
f2fs_io getflags file
for i in $(seq 1 10); do sync; echo 3 > /proc/sys/vm/drop_caches;\
time f2fs_io write 512 0 4096 zero osync file; truncate -s 0 file;\
done

[Result]
Before		After		Delta
21.243		21.694		-2.12%

For compression, we recommend to use ioctl to compress file data in
background for workaround.

For decompression, only zstd will be affected.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

fs/f2fs/compress.c

@@ -176,8 +176,7 @@ void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
 #ifdef CONFIG_F2FS_FS_LZO
 static int lzo_init_compress_ctx(struct compress_ctx *cc)
 {
-	cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
-				LZO1X_MEM_COMPRESS, GFP_NOFS);
+	cc->private = f2fs_vmalloc(LZO1X_MEM_COMPRESS);
 	if (!cc->private)
 		return -ENOMEM;
 
@@ -187,7 +186,7 @@ static int lzo_init_compress_ctx(struct compress_ctx *cc)
 
 static void lzo_destroy_compress_ctx(struct compress_ctx *cc)
 {
-	kvfree(cc->private);
+	vfree(cc->private);
 	cc->private = NULL;
 }
 
@@ -244,7 +243,7 @@ static int lz4_init_compress_ctx(struct compress_ctx *cc)
 		size = LZ4HC_MEM_COMPRESS;
 #endif
 
-	cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode), size, GFP_NOFS);
+	cc->private = f2fs_vmalloc(size);
 	if (!cc->private)
 		return -ENOMEM;
 
@@ -259,7 +258,7 @@ static int lz4_init_compress_ctx(struct compress_ctx *cc)
 
 static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
 {
-	kvfree(cc->private);
+	vfree(cc->private);
 	cc->private = NULL;
 }
 
@@ -340,8 +339,7 @@ static int zstd_init_compress_ctx(struct compress_ctx *cc)
 	params = zstd_get_params(level, cc->rlen);
 	workspace_size = zstd_cstream_workspace_bound(&params.cParams);
 
-	workspace = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
-					workspace_size, GFP_NOFS);
+	workspace = f2fs_vmalloc(workspace_size);
 	if (!workspace)
 		return -ENOMEM;
 
@@ -349,7 +347,7 @@ static int zstd_init_compress_ctx(struct compress_ctx *cc)
 	if (!stream) {
 		f2fs_err_ratelimited(F2FS_I_SB(cc->inode),
 				"%s zstd_init_cstream failed", __func__);
-		kvfree(workspace);
+		vfree(workspace);
 		return -EIO;
 	}
 
@@ -362,7 +360,7 @@ static int zstd_init_compress_ctx(struct compress_ctx *cc)
 
 static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
 {
-	kvfree(cc->private);
+	vfree(cc->private);
 	cc->private = NULL;
 	cc->private2 = NULL;
 }
@@ -421,8 +419,7 @@ static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
 
 	workspace_size = zstd_dstream_workspace_bound(max_window_size);
 
-	workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
-					workspace_size, GFP_NOFS);
+	workspace = f2fs_vmalloc(workspace_size);
 	if (!workspace)
 		return -ENOMEM;
 
@@ -430,7 +427,7 @@ static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
 	if (!stream) {
 		f2fs_err_ratelimited(F2FS_I_SB(dic->inode),
 				"%s zstd_init_dstream failed", __func__);
-		kvfree(workspace);
+		vfree(workspace);
 		return -EIO;
 	}
 
@@ -442,7 +439,7 @@ static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
 
 static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
 {
-	kvfree(dic->private);
+	vfree(dic->private);
 	dic->private = NULL;
 	dic->private2 = NULL;
 }

fs/f2fs/f2fs.h

@@ -3449,6 +3449,11 @@ static inline void *f2fs_kvzalloc(struct f2fs_sb_info *sbi,
 	return f2fs_kvmalloc(sbi, size, flags | __GFP_ZERO);
 }
 
+static inline void *f2fs_vmalloc(size_t size)
+{
+	return vmalloc(size);
+}
+
 static inline int get_extra_isize(struct inode *inode)
 {
 	return F2FS_I(inode)->i_extra_isize / sizeof(__le32);