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| author | Gao Xiang <hsiangkao@redhat.com> | 2020-12-09 13:37:17 +0100 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@redhat.com> | 2020-12-09 13:42:02 +0100 |
| commit | 1825c8d7ce93c4725cb04ad09627fc2829de32ca (patch) | |
| tree | 5cc5a28a3839c7d2dd7e05bfd998110da83f88a6 /fs/erofs/compress.h | |
| parent | erofs: simplify try_to_claim_pcluster() (diff) | |
| download | linux-1825c8d7ce93c4725cb04ad09627fc2829de32ca.tar.xz linux-1825c8d7ce93c4725cb04ad09627fc2829de32ca.zip | |
erofs: force inplace I/O under low memory scenario
Try to forcely switch to inplace I/O under low memory scenario in
order to avoid direct memory reclaim due to cached page allocation.
Link: https://lore.kernel.org/r/20201209123717.12430-1-hsiangkao@aol.com
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Diffstat (limited to 'fs/erofs/compress.h')
| -rw-r--r-- | fs/erofs/compress.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/erofs/compress.h b/fs/erofs/compress.h index 4dadde18cdf1..aea129ddda74 100644 --- a/fs/erofs/compress.h +++ b/fs/erofs/compress.h @@ -28,11 +28,13 @@ struct z_erofs_decompress_req { /* some special page->private (unsigned long, see below) */ #define Z_EROFS_SHORTLIVED_PAGE (-1UL << 2) +#define Z_EROFS_PREALLOCATED_PAGE (-2UL << 2) /* * For all pages in a pcluster, page->private should be one of * Type Last 2bits page->private * short-lived page 00 Z_EROFS_SHORTLIVED_PAGE + * preallocated page (tryalloc) 00 Z_EROFS_PREALLOCATED_PAGE * cached/managed page 00 pointer to z_erofs_pcluster * online page (file-backed, 01/10/11 sub-index << 2 | count * some pages can be used for inplace I/O) @@ -40,6 +42,7 @@ struct z_erofs_decompress_req { * page->mapping should be one of * Type page->mapping * short-lived page NULL + * preallocated page NULL * cached/managed page non-NULL or NULL (invalidated/truncated page) * online page non-NULL * |