Hello, guys. Synchronization in async got messy as more features were added and while being converted to workqueue. It currently has a global list of pending async items and per-domain running lists. Per-domain sync has to search through the global pending list and global sync has to iterate over all active registered domains.
This patchset reimplements async synchronization such that async items stay on two pending lists - global and per-domain - the whole time till completion, which simplifies both execution and synchronization. There's no need to moving around items on execution and both domain and global sync can look at the head of the list to determine the lowest cookie in flight. This patchset contains the following four patches. 0001-async-bring-sanity-to-the-use-of-words-domain-and-ru.patch 0002-async-use-ULLONG_MAX-for-infinity-cookie-value.patch 0003-async-keep-pending-tasks-on-async_domain-and-remove-.patch 0004-async-replace-list-of-active-domains-with-global-lis.patch 0001 is a prep patch. 0002 fixes a theoretical problem, which also helps the reimplemntation. 0003-0004 reimplement synchronization. This patch is on top of linus#master and "[PATCH] async: fix __lowest_in_progress()" http://thread.gmane.org/gmane.linux.kernel/1420814/focus=1423758 Once the __lowest_in_progress() fix patch is merged, I can route this series through a workqueue branch for 3.9. diffstat follows. include/linux/async.h | 9 -- kernel/async.c | 151 ++++++++++++++++++-------------------------------- 2 files changed, 59 insertions(+), 101 deletions(-) Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
