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authorSuresh Siddha <suresh.b.siddha@intel.com>2012-06-25 13:38:27 -0700
committerIngo Molnar <mingo@kernel.org>2012-07-06 11:00:21 +0200
commitb39f25a849d7677a7dbf183f2483fd41c201a5ce (patch)
tree87f06060976461b91d5cb196f0ed04fbcea0bb26 /arch/x86/kernel/vsmp_64.c
parentabf71f3066740f3b59c3f731b4b68ed335f7b24d (diff)
downloadlinux-b39f25a849d7677a7dbf183f2483fd41c201a5ce.tar.gz
x86/apic: Optimize cpu traversal in __assign_irq_vector() using domain membership
Currently __assign_irq_vector() goes through each cpu in the specified mask until it finds a free vector in all the cpu's that are part of the same interrupt domain. We visit all the interrupt domain sibling cpus to reserve the free vector. So, when we fail to find a free vector in an interrupt domain, it is safe to continue our search with a cpu belonging to a new interrupt domain. No need to go through each cpu, if the domain containing that cpu is already visited. Use the irq_cfg's old_domain to track the visited domains and optimize the cpu traversal while finding a free vector in the given cpumask. NOTE: We can also optimize the search by using for_each_cpu() and skip the current cpu, if it is not the first cpu in the mask returned by the vector_allocation_domain(). But re-using the cfg->old_domain to track the visited domains will be slightly faster. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Acked-by: Yinghai Lu <yinghai@kernel.org> Acked-by: Alexander Gordeev <agordeev@redhat.com> Acked-by: Cyrill Gorcunov <gorcunov@openvz.org> Link: http://lkml.kernel.org/r/1340656709-11423-2-git-send-email-suresh.b.siddha@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/vsmp_64.c')
-rw-r--r--arch/x86/kernel/vsmp_64.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c
index fa5adb7c228..3f0285ac00f 100644
--- a/arch/x86/kernel/vsmp_64.c
+++ b/arch/x86/kernel/vsmp_64.c
@@ -208,10 +208,9 @@ static int apicid_phys_pkg_id(int initial_apic_id, int index_msb)
* In vSMP, all cpus should be capable of handling interrupts, regardless of
* the APIC used.
*/
-static bool fill_vector_allocation_domain(int cpu, struct cpumask *retmask)
+static void fill_vector_allocation_domain(int cpu, struct cpumask *retmask)
{
cpumask_setall(retmask);
- return false;
}
static void vsmp_apic_post_init(void)