Author: kib
Date: Thu Oct 8 22:34:34 2020
New Revision: 366550
URL: https://svnweb.freebsd.org/changeset/base/366550
Log:
sig_intr(9): return early if AST is not scheduled.
Check td_flags for relevant AST requests lock-less. This opens the
race slightly wider where sig_intr() returns false negative, but might
be it is worth it.
Requested by: mjg
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Modified:
head/sys/kern/kern_sig.c
Modified: head/sys/kern/kern_sig.c
==============================================================================
--- head/sys/kern/kern_sig.c Thu Oct 8 22:31:11 2020 (r366549)
+++ head/sys/kern/kern_sig.c Thu Oct 8 22:34:34 2020 (r366550)
@@ -3212,6 +3212,9 @@ sig_intr(void)
int ret;
td = curthread;
+ if ((td->td_flags & (TDF_NEEDSIGCHK | TDF_NEEDSUSPCHK)) == 0)
+ return (0);
+
p = td->td_proc;
PROC_LOCK(p);
_______________________________________________
svn-src-head@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/svn-src-head
To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
