diff options
| author | Marcelo Tosatti <mtosatti@redhat.com> | 2024-04-01 12:36:40 -0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-04-03 19:14:53 -0700 |
| commit | 2f3c7195a702178629575b637f3f9a91eabdab73 (patch) | |
| tree | 2e29ca607c9b48d7bab415405e3cc303ca27078b /net/core/dev.c | |
| parent | 34c58c89feb3eefaf64e9ddf69b7e0f7c807414a (diff) | |
net: enable timestamp static key if CPU
For systems that use CPU isolation (via nohz_full), creating or destroying
a socket with SO_TIMESTAMP, SO_TIMESTAMPNS or SO_TIMESTAMPING with flag
SOF_TIMESTAMPING_RX_SOFTWARE will cause a static key to be enabled/disabled.
This in turn causes undesired IPIs to isolated CPUs.
So enable the static key unconditionally, if CPU isolation is enabled,
thus avoiding the IPIs.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/ZgrUiLLtbEUf9SFn@tpad
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/core/dev.c')
| -rw-r--r-- | net/core/dev.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 818699dea9d7..9b821d96eff3 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -77,6 +77,7 @@ #include <linux/hash.h> #include <linux/slab.h> #include <linux/sched.h> +#include <linux/sched/isolation.h> #include <linux/sched/mm.h> #include <linux/smpboot.h> #include <linux/mutex.h> @@ -11911,6 +11912,10 @@ static int __init net_dev_init(void) NULL, dev_cpu_dead); WARN_ON(rc < 0); rc = 0; + + /* avoid static key IPIs to isolated CPUs */ + if (housekeeping_enabled(HK_TYPE_MISC)) + net_enable_timestamp(); out: if (rc < 0) { for_each_possible_cpu(i) { |