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| author | Lai Jiangshan <laijs@cn.fujitsu.com> | 2013-02-19 12:17:01 -0800 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2013-03-04 09:44:57 -0800 |
| commit | 45d9550a0e7e9230606ca3c4c6f4dc6297848b2f (patch) | |
| tree | f7630d4336447782233f333379ffdd2c258f8b01 /kernel/workqueue.c | |
| parent | 6dbe51c251a327e012439c4772097a13df43c5b8 (diff) | |
| download | lwn-45d9550a0e7e9230606ca3c4c6f4dc6297848b2f.tar.gz lwn-45d9550a0e7e9230606ca3c4c6f4dc6297848b2f.zip | |
workqueue: allow more off-queue flag space
When a work item is off-queue, its work->data contains WORK_STRUCT_*
and WORK_OFFQ_* flags. As WORK_OFFQ_* flags are used only while a
work item is off-queue, it can occupy bits of work->data which aren't
used while off-queue. WORK_OFFQ_* currently only use bits used by
on-queue CWQ pointer. As color bits aren't used while off-queue,
there's no reason to not use them.
Lower WORK_OFFQ_FLAG_BASE from WORK_STRUCT_FLAG_BITS to
WORK_STRUCT_COLOR_SHIFT thus giving 4 more bits to off-queue flag
space which is also used to record worker_pool ID while off-queue.
This doesn't introduce any visible behavior difference.
tj: Rewrote the description.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/workqueue.c')
0 files changed, 0 insertions, 0 deletions