| Message ID | 20231030131254.488186-4-urezki@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | reduce latency of normal synchronize_rcu() v2 | expand |
On Mon, Oct 30, 2023 at 02:12:54PM +0100, Uladzislau Rezki (Sony) wrote: > This commit adds rcutree.rcu_normal_wake_from_gp description > to the kernel-parameters.txt file. > > Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Looks good aside from wordsmithing, thank you! Thanx, Paul > --- > Documentation/admin-guide/kernel-parameters.txt | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) > > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index 03a4bdb7512b..a9681d2492d3 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -5009,6 +5009,20 @@ > this kernel boot parameter, forcibly setting it > to zero. > > + rcutree.rcu_normal_wake_from_gp= [KNL] > + Reduces a latency of synchronize_rcu() call. This approach > + maintains its own track of synchronize_rcu() callers, so it > + does not interact with regular callbacks because it does not > + use a call_rcu[_hurry]() path. Please note, this is for a > + normal grace period. > + > + How to enable it: > + > + echo 1 > /sys/module/rcutree/parameters/rcu_normal_wake_from_gp > + or pass a boot parameter "rcutree.rcu_normal_wake_from_gp=1" > + > + Default is 0. > + > rcuscale.gp_async= [KNL] > Measure performance of asynchronous > grace-period primitives such as call_rcu(). > -- > 2.30.2 >
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 03a4bdb7512b..a9681d2492d3 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5009,6 +5009,20 @@ this kernel boot parameter, forcibly setting it to zero. + rcutree.rcu_normal_wake_from_gp= [KNL] + Reduces a latency of synchronize_rcu() call. This approach + maintains its own track of synchronize_rcu() callers, so it + does not interact with regular callbacks because it does not + use a call_rcu[_hurry]() path. Please note, this is for a + normal grace period. + + How to enable it: + + echo 1 > /sys/module/rcutree/parameters/rcu_normal_wake_from_gp + or pass a boot parameter "rcutree.rcu_normal_wake_from_gp=1" + + Default is 0. + rcuscale.gp_async= [KNL] Measure performance of asynchronous grace-period primitives such as call_rcu().
This commit adds rcutree.rcu_normal_wake_from_gp description to the kernel-parameters.txt file. Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com> --- Documentation/admin-guide/kernel-parameters.txt | 14 ++++++++++++++ 1 file changed, 14 insertions(+)