lkml.org 
[lkml]   [2013]   [Aug]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip:x86/spinlocks] xen, pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks
Commit-ID:  9f091fd2047dc4f9cc512e88f818786274fa646f
Gitweb: http://git.kernel.org/tip/9f091fd2047dc4f9cc512e88f818786274fa646f
Author: Jeremy Fitzhardinge <jeremy@goop.org>
AuthorDate: Tue, 6 Aug 2013 17:12:24 +0530
Committer: H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Thu, 8 Aug 2013 16:06:42 -0700

xen, pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks

Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org>
Link: http://lkml.kernel.org/r/20130806114224.20643.9099.sendpatchset@codeblue.in.ibm.com
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
arch/x86/xen/spinlock.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
index a458729..669a971 100644
--- a/arch/x86/xen/spinlock.c
+++ b/arch/x86/xen/spinlock.c
@@ -244,6 +244,8 @@ void xen_uninit_lock_cpu(int cpu)
per_cpu(irq_name, cpu) = NULL;
}

+static bool xen_pvspin __initdata = true;
+
void __init xen_init_spinlocks(void)
{
/*
@@ -253,10 +255,22 @@ void __init xen_init_spinlocks(void)
if (xen_hvm_domain())
return;

+ if (!xen_pvspin) {
+ printk(KERN_DEBUG "xen: PV spinlocks disabled\n");
+ return;
+ }
+
pv_lock_ops.lock_spinning = xen_lock_spinning;
pv_lock_ops.unlock_kick = xen_unlock_kick;
}

+static __init int xen_parse_nopvspin(char *arg)
+{
+ xen_pvspin = false;
+ return 0;
+}
+early_param("xen_nopvspin", xen_parse_nopvspin);
+
#ifdef CONFIG_XEN_DEBUG_FS

static struct dentry *d_spin_debug;

\
 
 \ /
  Last update: 2013-08-09 01:41    [W:1.566 / U:0.120 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site