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| author | Paul E. McKenney <[email protected]> | 2023-07-05 20:34:43 -0700 |
|---|---|---|
| committer | Daniel Borkmann <[email protected]> | 2023-07-12 23:45:23 +0200 |
| commit | 43a89baecfe200cb4530f42b9fcf904925d6d14a (patch) | |
| tree | 49f4959bd244b9885cb585e1663cce7988cf334d /drivers/fpga/fpga-mgr.c | |
| parent | 04fabf00b4d3aff5d010ecb617001814e409e24a (diff) | |
rcu: Export rcu_request_urgent_qs_task()
If a CPU is executing a long series of non-sleeping system calls,
RCU grace periods can be delayed for on the order of a couple hundred
milliseconds. This is normally not a problem, but if each system call
does a call_rcu(), those callbacks can stack up. RCU will eventually
notice this callback storm, but use of rcu_request_urgent_qs_task()
allows the code invoking call_rcu() to give RCU a heads up.
This function is not for general use, not yet, anyway.
Reported-by: Alexei Starovoitov <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
Diffstat (limited to 'drivers/fpga/fpga-mgr.c')
0 files changed, 0 insertions, 0 deletions