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| author | Zhang, Jun <jun.zhang@intel.com> | 2018-12-19 19:37:34 +0100 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.ibm.com> | 2019-01-26 00:30:00 +0100 |
| commit | 13dc7d0c7a2ed438f0ec8e9fb365a1256d87cf87 (patch) | |
| tree | 08cc0cbdabd91e8ca1f5621a569e971f59f558e3 /Documentation/admin-guide | |
| parent | rcu: Do RCU GP kthread self-wakeup from softirq and interrupt (diff) | |
| download | linux-13dc7d0c7a2ed438f0ec8e9fb365a1256d87cf87.tar.xz linux-13dc7d0c7a2ed438f0ec8e9fb365a1256d87cf87.zip | |
rcu: Prevent needless ->gp_seq_needed update in __note_gp_changes()
Currently, __note_gp_changes() checks to see if the rcu_node structure's
->gp_seq_needed is greater than or equal to that of the rcu_data
structure, and if so, updates the rcu_data structure's ->gp_seq_needed
field. This results in a useless store in the case where the two fields
are equal.
This commit therefore carries out this store only in the case where the
rcu_node structure's ->gp_seq_needed is strictly greater than that of
the rcu_data structure.
Signed-off-by: "Zhang, Jun" <jun.zhang@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Link: https://lkml.kernel.org/r/88DC34334CA3444C85D647DBFA962C2735AD5F77@SHSMSX104.ccr.corp.intel.com
Diffstat (limited to 'Documentation/admin-guide')
0 files changed, 0 insertions, 0 deletions