Date: Tue, 9 Jul 2002 14:59:34 -0700 (PDT) From: Julian Elischer <julian@elischer.org> To: Bruce Evans <bde@zeta.org.au> Cc: John Baldwin <jhb@FreeBSD.ORG>, FreeBSD current users <current@FreeBSD.ORG>, FreeBSD current users <current@FreeBSD.ORG> Subject: RE: userret() , ast() and the end of syscalls Message-ID: <Pine.BSF.4.21.0207091453230.35930-100000@InterJet.elischer.org> In-Reply-To: <20020710071340.R8522-100000@gamplex.bde.org>
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On Wed, 10 Jul 2002, Bruce Evans wrote:
> Hopefully there won't be any unconditional code. Unconditional code
> in userret() pessimizes all syscalls. Unconditional code added by KSEIII
> pessimized basic syscall overhead by 10% according to lmbench2.
Mostly it's conditional..
if (p->p_flag & P_KSES)
in syscall()
and
if (p->p_flag & P_KSES) {
in userret()
it's probably
PROC_LOCK(p);
thread_suspend_check(0); /* Can suspend or kill */
PROC_UNLOCK(p);
try replace it with:
if (P_SHOULDSTOP(p) {
PROC_LOCK(p);
thread_suspend_check(0); /* Can suspend or kill */
PROC_UNLOCK(p);
}
>
> Bruce
>
>
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