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authorHuang Jianan <huangjianan@oppo.com>2021-03-17 06:54:47 +0300
committerGao Xiang <hsiangkao@redhat.com>2021-03-29 05:18:00 +0300
commit648f2de053a882c87c05f0060f47d3b11841fdbe (patch)
treee3e9cde207e24544f3d27d51c631ab82928477f0 /fs/erofs
parentb4892fa3e7fd69e78a82356de45b90758589cafc (diff)
downloadlinux-648f2de053a882c87c05f0060f47d3b11841fdbe.tar.xz
erofs: use workqueue decompression for atomic contexts only
z_erofs_decompressqueue_endio may not be executed in the atomic context, for example, when dm-verity is turned on. In this scenario, data can be decompressed directly to get rid of additional kworker scheduling overhead. Link: https://lore.kernel.org/r/20210317035448.13921-2-huangjianan@oppo.com Reviewed-by: Gao Xiang <hsiangkao@redhat.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Huang Jianan <huangjianan@oppo.com> Signed-off-by: Guo Weichao <guoweichao@oppo.com> Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Diffstat (limited to 'fs/erofs')
-rw-r--r--fs/erofs/zdata.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index 3851e1a64f73..9530b611f94b 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -706,6 +706,7 @@ err_out:
goto out;
}
+static void z_erofs_decompressqueue_work(struct work_struct *work);
static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io,
bool sync, int bios)
{
@@ -720,8 +721,14 @@ static void z_erofs_decompress_kickoff(struct z_erofs_decompressqueue *io,
return;
}
- if (!atomic_add_return(bios, &io->pending_bios))
+ if (atomic_add_return(bios, &io->pending_bios))
+ return;
+ /* Use workqueue decompression for atomic contexts only */
+ if (in_atomic() || irqs_disabled()) {
queue_work(z_erofs_workqueue, &io->u.work);
+ return;
+ }
+ z_erofs_decompressqueue_work(&io->u.work);
}
static bool z_erofs_page_is_invalidated(struct page *page)