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runtime: only poll network from one P at a time in findRunnable

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For #65064

Change-Id: Ifecd7e332d2cf251750752743befeda4ed396f33
Reviewed-on: https://go-review.googlesource.com/c/go/+/564197
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Artur M. Wolff <artur.m.wolff@gmail.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
This commit is contained in:
Ian Lance Taylor 2024-02-14 17:54:00 -08:00 committed by Michael Pratt
parent 336626bac4
commit 352dd2d932
2 changed files with 10 additions and 5 deletions
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8
src/runtime/proc.go
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@ -3387,8 +3387,12 @@ top:
// blocked thread (e.g. it has already returned from netpoll, but does // blocked thread (e.g. it has already returned from netpoll, but does
// not set lastpoll yet), this thread will do blocking netpoll below // not set lastpoll yet), this thread will do blocking netpoll below
// anyway. // anyway.
if netpollinited() && netpollAnyWaiters() && sched.lastpoll.Load() != 0 { // We only poll from one thread at a time to avoid kernel contention
if list, delta := netpoll(0); !list.empty() { // non-blocking // on machines with many cores.
if netpollinited() && netpollAnyWaiters() && sched.lastpoll.Load() != 0 && sched.pollingNet.Swap(1) == 0 {
list, delta := netpoll(0)
sched.pollingNet.Store(0)
if !list.empty() { // non-blocking
gp := list.pop() gp := list.pop()
injectglist(&list) injectglist(&list)
netpollAdjustWaiters(delta) netpollAdjustWaiters(delta)

7
src/runtime/runtime2.go
View File

@ -757,9 +757,10 @@ type p struct {
} }
type schedt struct { type schedt struct {
goidgen atomic.Uint64 goidgen atomic.Uint64
lastpoll atomic.Int64 // time of last network poll, 0 if currently polling lastpoll atomic.Int64 // time of last network poll, 0 if currently polling
pollUntil atomic.Int64 // time to which current poll is sleeping pollUntil atomic.Int64 // time to which current poll is sleeping
pollingNet atomic.Int32 // 1 if some P doing non-blocking network poll
lock mutex lock mutex