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| author | Gao Xiang <gaoxiang25@huawei.com> | 2018-11-23 01:21:48 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-23 10:53:08 +0100 |
| commit | 2d9b5dcd99428f9b8faea7f76c3e30c37c32cc9c (patch) | |
| tree | 57f8c12e6425e2eb00b93a1f0695d7fecf1ef4be /drivers/staging/erofs | |
| parent | 23edf3abe7abb1d1ab856c893629b96209473a5b (diff) | |
| download | linux-stable-2d9b5dcd99428f9b8faea7f76c3e30c37c32cc9c.tar.gz linux-stable-2d9b5dcd99428f9b8faea7f76c3e30c37c32cc9c.tar.bz2 linux-stable-2d9b5dcd99428f9b8faea7f76c3e30c37c32cc9c.zip | |
staging: erofs: decompress asynchronously if PG_readahead page at first
For the case of nr_to_read == lookahead_size, it is better to
decompress asynchronously as well since no page will be needed immediately.
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/erofs')
| -rw-r--r-- | drivers/staging/erofs/unzip_vle.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/staging/erofs/unzip_vle.c b/drivers/staging/erofs/unzip_vle.c index 6aa3c989dd4e..fab907e0fe06 100644 --- a/drivers/staging/erofs/unzip_vle.c +++ b/drivers/staging/erofs/unzip_vle.c @@ -1345,8 +1345,8 @@ static int z_erofs_vle_normalaccess_readpages(struct file *filp, { struct inode *const inode = mapping->host; struct erofs_sb_info *const sbi = EROFS_I_SB(inode); - const bool sync = __should_decompress_synchronously(sbi, nr_pages); + bool sync = __should_decompress_synchronously(sbi, nr_pages); struct z_erofs_vle_frontend f = VLE_FRONTEND_INIT(inode); gfp_t gfp = mapping_gfp_constraint(mapping, GFP_KERNEL); struct page *head = NULL; @@ -1364,6 +1364,13 @@ static int z_erofs_vle_normalaccess_readpages(struct file *filp, prefetchw(&page->flags); list_del(&page->lru); + /* + * A pure asynchronous readahead is indicated if + * a PG_readahead marked page is hitted at first. + * Let's also do asynchronous decompression for this case. + */ + sync &= !(PageReadahead(page) && !head); + if (add_to_page_cache_lru(page, mapping, page->index, gfp)) { list_add(&page->lru, &pagepool); continue; |