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workqueue: allow more off-queue flag space

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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>
This commit is contained in:
Lai Jiangshan 2013-02-19 12:17:01 -08:00 committed by Tejun Heo
parent 6dbe51c251
commit 45d9550a0e
1 changed files with 1 additions and 1 deletions
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2
include/linux/workqueue.h
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@ -68,7 +68,7 @@ enum {
WORK_STRUCT_COLOR_BITS,
/* data contains off-queue information when !WORK_STRUCT_PWQ */
WORK_OFFQ_FLAG_BASE = WORK_STRUCT_FLAG_BITS,
WORK_OFFQ_FLAG_BASE = WORK_STRUCT_COLOR_SHIFT,
WORK_OFFQ_CANCELING = (1 << WORK_OFFQ_FLAG_BASE),