Date: Fri, 13 Jan 2012 20:25:39 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r230083 - stable/9/sys/kern Message-ID: <201201132025.q0DKPddv079013@svn.freebsd.org>
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Author: jhb Date: Fri Jan 13 20:25:38 2012 New Revision: 230083 URL: http://svn.freebsd.org/changeset/base/230083 Log: MFC 228960: Cap the priority calculated from the current thread's running tick count at SCHED_PRI_RANGE to prevent overflows in the priority value. This can happen due to irregularities with clock interrupts under certain virtualization environments. Modified: stable/9/sys/kern/sched_ule.c Directory Properties: stable/9/sys/ (props changed) stable/9/sys/amd64/include/xen/ (props changed) stable/9/sys/boot/ (props changed) stable/9/sys/boot/i386/efi/ (props changed) stable/9/sys/boot/ia64/efi/ (props changed) stable/9/sys/boot/ia64/ski/ (props changed) stable/9/sys/boot/powerpc/boot1.chrp/ (props changed) stable/9/sys/boot/powerpc/ofw/ (props changed) stable/9/sys/cddl/contrib/opensolaris/ (props changed) stable/9/sys/conf/ (props changed) stable/9/sys/contrib/dev/acpica/ (props changed) stable/9/sys/contrib/octeon-sdk/ (props changed) stable/9/sys/contrib/pf/ (props changed) stable/9/sys/contrib/x86emu/ (props changed) Modified: stable/9/sys/kern/sched_ule.c ============================================================================== --- stable/9/sys/kern/sched_ule.c Fri Jan 13 20:23:18 2012 (r230082) +++ stable/9/sys/kern/sched_ule.c Fri Jan 13 20:25:38 2012 (r230083) @@ -1429,7 +1429,8 @@ sched_priority(struct thread *td) } else { pri = SCHED_PRI_MIN; if (td->td_sched->ts_ticks) - pri += SCHED_PRI_TICKS(td->td_sched); + pri += min(SCHED_PRI_TICKS(td->td_sched), + SCHED_PRI_RANGE); pri += SCHED_PRI_NICE(td->td_proc->p_nice); KASSERT(pri >= PRI_MIN_BATCH && pri <= PRI_MAX_BATCH, ("sched_priority: invalid priority %d: nice %d, "
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