Date: Thu, 8 Oct 2020 22:34:35 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r366550 - head/sys/kern Message-ID: <202010082234.098MYZmB019459@repo.freebsd.org>
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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);
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