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author | Tejun Heo <tj@kernel.org> | 2013-01-23 09:32:30 -0800 |
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committer | Tejun Heo <tj@kernel.org> | 2013-01-23 09:32:30 -0800 |
commit | 52722794d6a48162fd8906d54618ae60a4abdb21 (patch) | |
tree | 9395231ed86edd40880a3438f77d10af2f6d953a /include/linux/async.h | |
parent | c68eee14ec2da345e86f2778c8570759309a4a2e (diff) | |
download | linux-stable-52722794d6a48162fd8906d54618ae60a4abdb21.tar.gz linux-stable-52722794d6a48162fd8906d54618ae60a4abdb21.tar.bz2 linux-stable-52722794d6a48162fd8906d54618ae60a4abdb21.zip |
async: keep pending tasks on async_domain and remove async_pending
Async kept single global pending list and per-domain running lists.
When an async item is queued, it's put on the global pending list.
The item is moved to the per-domain running list when its execution
starts.
At this point, this design complicates execution and synchronization
without bringing any benefit. The list only matters for
synchronization which doesn't care whether a given async item is
pending or executing. Also, global synchronization is done by
iterating through all active registered async_domains, so the global
async_pending list doesn't help anything either.
Rename async_domain->running to async_domain->pending and put async
items directly there and remove when execution completes. This
simplifies lowest_in_progress() a lot - the first item on the pending
list is the one with the lowest cookie, and async_run_entry_fn()
doesn't have to mess with moving the item from pending to running.
After the change, whether a domain is empty or not can be trivially
determined by looking at async_domain->pending. Remove
async_domain->count and use list_empty() on pending instead.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Dan Williams <djbw@fb.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/async.h')
-rw-r--r-- | include/linux/async.h | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/include/linux/async.h b/include/linux/async.h index 34ff5c610e0e..a2e3f18b2ad6 100644 --- a/include/linux/async.h +++ b/include/linux/async.h @@ -19,8 +19,7 @@ typedef u64 async_cookie_t; typedef void (async_func_ptr) (void *data, async_cookie_t cookie); struct async_domain { struct list_head node; - struct list_head running; - int count; + struct list_head pending; unsigned registered:1; }; @@ -29,8 +28,7 @@ struct async_domain { */ #define ASYNC_DOMAIN(_name) \ struct async_domain _name = { .node = LIST_HEAD_INIT(_name.node), \ - .running = LIST_HEAD_INIT(_name.running), \ - .count = 0, \ + .pending = LIST_HEAD_INIT(_name.pending), \ .registered = 1 } /* @@ -39,8 +37,7 @@ struct async_domain { */ #define ASYNC_DOMAIN_EXCLUSIVE(_name) \ struct async_domain _name = { .node = LIST_HEAD_INIT(_name.node), \ - .running = LIST_HEAD_INIT(_name.running), \ - .count = 0, \ + .pending = LIST_HEAD_INIT(_name.pending), \ .registered = 0 } extern async_cookie_t async_schedule(async_func_ptr *ptr, void *data); |