Date: Thu, 22 Nov 2018 21:38:24 +0000 (UTC) From: Mateusz Guzik <mjg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r340786 - head/sys/kern Message-ID: <201811222138.wAMLcOtw039889@repo.freebsd.org>
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Author: mjg Date: Thu Nov 22 21:38:24 2018 New Revision: 340786 URL: https://svnweb.freebsd.org/changeset/base/340786 Log: Annotate TDP_RFPPWAIT as unlikely. The flag is only set on vfork, but is tested for *all* syscalls. On amd64 this shortens common-case (not vfork) code. Modified: head/sys/kern/subr_syscall.c Modified: head/sys/kern/subr_syscall.c ============================================================================== --- head/sys/kern/subr_syscall.c Thu Nov 22 21:29:36 2018 (r340785) +++ head/sys/kern/subr_syscall.c Thu Nov 22 21:38:24 2018 (r340786) @@ -230,7 +230,7 @@ syscallret(struct thread *td, int error) PROC_UNLOCK(p); } - if (td->td_pflags & TDP_RFPPWAIT) { + if (__predict_false(td->td_pflags & TDP_RFPPWAIT)) { /* * Preserve synchronization semantics of vfork. If * waiting for child to exec or exit, fork set
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