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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-10-26 11:11:40 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2010-11-30 07:02:40 +0100 |
| commit | 46fdb0937f26124700fc9fc80da4776330cc00d3 (patch) | |
| tree | ce3bdf6c0379fdab8c72085f885402751fadea52 /Documentation/Smack.txt | |
| parent | rcu: fix race condition in synchronize_sched_expedited() (diff) | |
| download | linux-46fdb0937f26124700fc9fc80da4776330cc00d3.tar.xz linux-46fdb0937f26124700fc9fc80da4776330cc00d3.zip | |
rcu: Make synchronize_srcu_expedited() fast if running readers
The synchronize_srcu_expedited() function is currently quick if there
are no active readers, but will delay a full jiffy if there are any.
If these readers leave their SRCU read-side critical sections quickly,
this is way too long to wait. So this commit first waits ten microseconds,
and only then falls back to jiffy-at-a-time waiting.
Reported-by: Avi Kivity <avi@redhat.com>
Reported-by: Marcelo Tosatti <mtosatti@redhat.com>
Tested-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'Documentation/Smack.txt')
0 files changed, 0 insertions, 0 deletions