From 7c3eed5cd60d0f736516e6ade77d90c6255860bd Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Thu, 24 Jan 2013 11:01:33 -0800 Subject: workqueue: record pool ID instead of CPU in work->data when off-queue Currently, when a work item is off-queue, work->data records the CPU it was last on, which is used to locate the last executing instance for non-reentrance, flushing, etc. We're in the process of removing global_cwq and making worker_pool the top level abstraction. This patch makes work->data point to the pool it was last associated with instead of CPU. After the previous WORK_OFFQ_POOL_CPU and worker_poo->id additions, the conversion is fairly straight-forward. WORK_OFFQ constants and functions are modified to record and read back pool ID instead. worker_pool_by_id() is added to allow looking up pool from ID. get_work_pool() replaces get_work_gcwq(), which is reimplemented using get_work_pool(). get_work_pool_id() replaces work_cpu(). This patch shouldn't introduce any observable behavior changes. Signed-off-by: Tejun Heo Reviewed-by: Lai Jiangshan --- include/linux/workqueue.h | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) (limited to 'include/linux/workqueue.h') diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h index f8b35763e55f..a94e4e84e7b1 100644 --- a/include/linux/workqueue.h +++ b/include/linux/workqueue.h @@ -75,19 +75,19 @@ enum { /* * When a work item is off queue, its high bits point to the last - * cpu it was on. Cap at 31 bits and use the highest number to - * indicate that no cpu is associated. + * pool it was on. Cap at 31 bits and use the highest number to + * indicate that no pool is associated. */ WORK_OFFQ_FLAG_BITS = 1, - WORK_OFFQ_CPU_SHIFT = WORK_OFFQ_FLAG_BASE + WORK_OFFQ_FLAG_BITS, - WORK_OFFQ_LEFT = BITS_PER_LONG - WORK_OFFQ_CPU_SHIFT, - WORK_OFFQ_CPU_BITS = WORK_OFFQ_LEFT <= 31 ? WORK_OFFQ_LEFT : 31, - WORK_OFFQ_CPU_NONE = (1LU << WORK_OFFQ_CPU_BITS) - 1, + WORK_OFFQ_POOL_SHIFT = WORK_OFFQ_FLAG_BASE + WORK_OFFQ_FLAG_BITS, + WORK_OFFQ_LEFT = BITS_PER_LONG - WORK_OFFQ_POOL_SHIFT, + WORK_OFFQ_POOL_BITS = WORK_OFFQ_LEFT <= 31 ? WORK_OFFQ_LEFT : 31, + WORK_OFFQ_POOL_NONE = (1LU << WORK_OFFQ_POOL_BITS) - 1, /* convenience constants */ WORK_STRUCT_FLAG_MASK = (1UL << WORK_STRUCT_FLAG_BITS) - 1, WORK_STRUCT_WQ_DATA_MASK = ~WORK_STRUCT_FLAG_MASK, - WORK_STRUCT_NO_CPU = (unsigned long)WORK_OFFQ_CPU_NONE << WORK_OFFQ_CPU_SHIFT, + WORK_STRUCT_NO_POOL = (unsigned long)WORK_OFFQ_POOL_NONE << WORK_OFFQ_POOL_SHIFT, /* bit mask for work_busy() return values */ WORK_BUSY_PENDING = 1 << 0, @@ -103,9 +103,9 @@ struct work_struct { #endif }; -#define WORK_DATA_INIT() ATOMIC_LONG_INIT(WORK_STRUCT_NO_CPU) +#define WORK_DATA_INIT() ATOMIC_LONG_INIT(WORK_STRUCT_NO_POOL) #define WORK_DATA_STATIC_INIT() \ - ATOMIC_LONG_INIT(WORK_STRUCT_NO_CPU | WORK_STRUCT_STATIC) + ATOMIC_LONG_INIT(WORK_STRUCT_NO_POOL | WORK_STRUCT_STATIC) struct delayed_work { struct work_struct work; -- cgit v1.2.3-71-gd317