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| author |   Paul E. McKenney <paulmck@kernel.org> | 2022-08-02 17:04:54 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-08-31 05:08:08 -0700 |
| commit | 76ea364161e72b1878126edf8d507d2a62fb47b0 (patch) | |
| tree | e8dc7f2d60fc85c8455c12ae8040c927d3efe693 /tools/perf/scripts/python/call-graph-from-sql.py | |
| parent | rcutorture: Verify long-running reader prevents full polling from completing (diff) | |
| download | linux-dev-76ea364161e72b1878126edf8d507d2a62fb47b0.tar.xz linux-dev-76ea364161e72b1878126edf8d507d2a62fb47b0.zip | |
rcu: Add full-sized polling for start_poll()
The start_poll_synchronize_rcu() API compresses the combined expedited and
normal grace-period states into a single unsigned long, which conserves
storage, but can miss grace periods in certain cases involving overlapping
normal and expedited grace periods. Missing the occasional grace period
is usually not a problem, but there are use cases that care about each
and every grace period.
This commit therefore adds the next member of the full-state RCU
grace-period polling API, namely the start_poll_synchronize_rcu_full()
function. This uses up to three times the storage (rcu_gp_oldstate
structure instead of unsigned long), but is guaranteed not to miss
grace periods.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-sql.py')
0 files changed, 0 insertions, 0 deletions