On 05/03/2012 02:07 PM, Rik van Riel wrote:
On 05/03/2012 01:34 PM, rajman mekaco wrote:
The user_shm_lock and user_shm_unlock functions use a single global
spinlock for protecting the user->locked_shm.
This is an overhead for multiple CPUs calling this code even if they
are having different user_struct.
Remove the global shmlock_user_lock and introduce and use a new
spinlock inside of the user_struct structure.
Signed-off-by: rajman mekaco<rajman.mekaco@xxxxxxxxx>
Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
Hold this ... while the patch is correct, Peter raised
a valid concern about its usefulness, which should be
sorted out first.
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