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authorXiaoming Ni <nixiaoming@huawei.com>2022-10-19 06:09:29 +0300
committerAndrew Morton <akpm@linux-foundation.org>2022-11-19 00:55:08 +0300
commit80f784098ff44e086f68f0e8c98b6c6da8702ec4 (patch)
treeebc40972366631d083b3d84a7f38a22d1953b3ac /fs/squashfs/decompressor_single.c
parent4197530bf167d5f15e68c4e4e982368c3d0a0112 (diff)
downloadlinux-80f784098ff44e086f68f0e8c98b6c6da8702ec4.tar.xz
squashfs: add the mount parameter theads=<single|multi|percpu>
Patch series 'squashfs: Add the mount parameter "threads="'. Currently, Squashfs supports multiple decompressor parallel modes. However, this mode can be configured only during kernel building and does not support flexible selection during runtime. In the current patch set, the mount parameter "threads=" is added to allow users to select the parallel decompressor mode and configure the number of decompressors when mounting a file system. "threads=<single|multi|percpu|1|2|3|...>" The upper limit is num_online_cpus() * 2. This patch (of 2): Squashfs supports three decompression concurrency modes: Single-thread mode: concurrent reads are blocked and the memory overhead is small. Multi-thread mode/percpu mode: reduces concurrent read blocking but increases memory overhead. The corresponding schema must be fixed at compile time. During mounting, the concurrent decompression mode cannot be adjusted based on file read blocking. The mount parameter theads=<single|multi|percpu> is added to select the concurrent decompression mode of a single SquashFS file system image. Link: https://lkml.kernel.org/r/20221019030930.130456-1-nixiaoming@huawei.com Link: https://lkml.kernel.org/r/20221019030930.130456-2-nixiaoming@huawei.com Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com> Reviewed-by: Phillip Lougher <phillip@squashfs.org.uk> Cc: Jianguo Chen <chenjianguo3@huawei.com> Cc: Jubin Zhong <zhongjubin@huawei.com> Cc: Zhang Yi <yi.zhang@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'fs/squashfs/decompressor_single.c')
-rw-r--r--fs/squashfs/decompressor_single.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/fs/squashfs/decompressor_single.c b/fs/squashfs/decompressor_single.c
index 4eb3d083d45e..6f161887710b 100644
--- a/fs/squashfs/decompressor_single.c
+++ b/fs/squashfs/decompressor_single.c
@@ -24,7 +24,7 @@ struct squashfs_stream {
struct mutex mutex;
};
-void *squashfs_decompressor_create(struct squashfs_sb_info *msblk,
+static void *squashfs_decompressor_create(struct squashfs_sb_info *msblk,
void *comp_opts)
{
struct squashfs_stream *stream;
@@ -49,7 +49,7 @@ out:
return ERR_PTR(err);
}
-void squashfs_decompressor_destroy(struct squashfs_sb_info *msblk)
+static void squashfs_decompressor_destroy(struct squashfs_sb_info *msblk)
{
struct squashfs_stream *stream = msblk->stream;
@@ -59,7 +59,7 @@ void squashfs_decompressor_destroy(struct squashfs_sb_info *msblk)
}
}
-int squashfs_decompress(struct squashfs_sb_info *msblk, struct bio *bio,
+static int squashfs_decompress(struct squashfs_sb_info *msblk, struct bio *bio,
int offset, int length,
struct squashfs_page_actor *output)
{
@@ -78,7 +78,14 @@ int squashfs_decompress(struct squashfs_sb_info *msblk, struct bio *bio,
return res;
}
-int squashfs_max_decompressors(void)
+static int squashfs_max_decompressors(void)
{
return 1;
}
+
+const struct squashfs_decompressor_thread_ops squashfs_decompressor_single = {
+ .create = squashfs_decompressor_create,
+ .destroy = squashfs_decompressor_destroy,
+ .decompress = squashfs_decompress,
+ .max_decompressors = squashfs_max_decompressors,
+};