On Mon, 2012-10-15 at 20:17 +0400, Stanislav Kinsbursky wrote: > This patch is required CRIU project (www.criu.org). > To migrate processes with posix timers we have to make sure, that we can > restore posix timer with proper id. > Currently, this is not true, because timer ids are allocated globally. > So, this is precursor patch and it's purpose is make posix timer id to be > allocated per task. > > Patch replaces global idr with global hash table for posix timers and > makes timer ids unique not globally, but per task. Next free timer id is type > of integer and stored on signal struct (posix_timer_id). If free timer id > reaches negative value on timer creation, it will be dropped to zero and > -EAGAIN will be returned to user. > Hash table is size of page (4KB). > Key is constructed as follows: > key = hash_ptr(current->signal) ^ hash_32(posix_timer_id); > > Signed-off-by: Stanislav Kinsbursky <skinsbur...@parallels.com>
Hmm, it seems you removed idr, rcu friendly, and reinstated a fixed size hash table, protected by a _single_ spinlock ? Oh well. Please take a look at commit 8af088710d1e, and make sure you fix your problem and keep performance as good as before. _______________________________________________ Devel mailing list Devel@openvz.org https://openvz.org/mailman/listinfo/devel
