* libgo patch committed: Check for preemption in fast syscall return
@ 2018-02-20 15:30 Ian Lance Taylor
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From: Ian Lance Taylor @ 2018-02-20 15:30 UTC (permalink / raw)
To: gcc-patches, gofrontend-dev
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This libgo patch checks for preemption in the fast return path from a
system call. This helps with tight loops that make system calls, as
in BenchmarkSyscallExcessWork. Bootstrapped and ran Go testsuite on
x86_64-pc-linux-gnu. Committed to mainline.
Ian
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Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE (revision 257845)
+++ gcc/go/gofrontend/MERGE (working copy)
@@ -1,4 +1,4 @@
-459a8a94e04a19bde7173ef7cf2db369c2e62e2d
+c6e0970f75508e209a10a7db5164d6ea3f9b28bf
The first line of this file holds the git revision number of the last
merge done from the gofrontend repository.
Index: libgo/go/runtime/proc.go
===================================================================
--- libgo/go/runtime/proc.go (revision 257743)
+++ libgo/go/runtime/proc.go (working copy)
@@ -2794,6 +2794,13 @@ func exitsyscall(dummy int32) {
exitsyscallclear(_g_)
_g_.m.locks--
_g_.throwsplit = false
+
+ // Check preemption, since unlike gc we don't check on
+ // every call.
+ if getg().preempt {
+ checkPreempt()
+ }
+
return
}
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2018-02-20 15:30 libgo patch committed: Check for preemption in fast syscall return Ian Lance Taylor
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