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| author | Gao Xiang <hsiangkao@redhat.com> | 2021-04-09 21:06:30 +0200 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@redhat.com> | 2021-04-09 21:19:59 +0200 |
| commit | 524887347fcb67faa0a63dd3c4c02ab48d4968d4 (patch) | |
| tree | 2a11ca8b2e7c11e74b6f4d1cfb39d2a0c182d7a9 /fs/erofs/decompressor.c | |
| parent | erofs: reserve physical_clusterbits[] (diff) | |
| download | linux-524887347fcb67faa0a63dd3c4c02ab48d4968d4.tar.xz linux-524887347fcb67faa0a63dd3c4c02ab48d4968d4.zip | |
erofs: introduce multipage per-CPU buffers
To deal the with the cases which inplace decompression is infeasible
for some inplace I/O. Per-CPU buffers was introduced to get rid of page
allocation latency and thrash for low-latency decompression algorithms
such as lz4.
For the big pcluster feature, introduce multipage per-CPU buffers to
keep such inplace I/O pclusters temporarily as well but note that
per-CPU pages are just consecutive virtually.
When a new big pcluster fs is mounted, its max pclustersize will be
read and per-CPU buffers can be growed if needed. Shrinking adjustable
per-CPU buffers is more complex (because we don't know if such size
is still be used), so currently just release them all when unloading.
Link: https://lore.kernel.org/r/20210409190630.19569-1-xiang@kernel.org
Acked-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Diffstat (limited to 'fs/erofs/decompressor.c')
| -rw-r--r-- | fs/erofs/decompressor.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/erofs/decompressor.c b/fs/erofs/decompressor.c index 27aa6a99b371..fb4838c0f0df 100644 --- a/fs/erofs/decompressor.c +++ b/fs/erofs/decompressor.c @@ -47,7 +47,9 @@ int z_erofs_load_lz4_config(struct super_block *sb, EROFS_SB(sb)->lz4.max_distance_pages = distance ? DIV_ROUND_UP(distance, PAGE_SIZE) + 1 : LZ4_MAX_DISTANCE_PAGES; - return 0; + + /* TODO: use max pclusterblks after bigpcluster is enabled */ + return erofs_pcpubuf_growsize(1); } static int z_erofs_lz4_prepare_destpages(struct z_erofs_decompress_req *rq, @@ -114,7 +116,7 @@ static void *generic_copy_inplace_data(struct z_erofs_decompress_req *rq, * pages should be copied in order to avoid being overlapped. */ struct page **in = rq->in; - u8 *const tmp = erofs_get_pcpubuf(0); + u8 *const tmp = erofs_get_pcpubuf(1); u8 *tmpp = tmp; unsigned int inlen = rq->inputsize - pageofs_in; unsigned int count = min_t(uint, inlen, PAGE_SIZE - pageofs_in); @@ -271,7 +273,7 @@ static int z_erofs_decompress_generic(struct z_erofs_decompress_req *rq, * compressed data is preferred. */ if (rq->outputsize <= PAGE_SIZE * 7 / 8) { - dst = erofs_get_pcpubuf(0); + dst = erofs_get_pcpubuf(1); if (IS_ERR(dst)) return PTR_ERR(dst); |