On 23/01/15 18:58, Luis R. Rodriguez wrote:
Its not just hypercalls though, this is all about the interactions
with multicalls no?
No. This applies to any preemptible hypercall and the toolstack doesn't
use multicalls for most of its work.
David
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On 23.01.15 at 19:58, mcg...@suse.com wrote:
On Fri, Jan 23, 2015 at 11:45:06AM +, David Vrabel wrote:
On 23/01/15 00:29, Luis R. Rodriguez wrote:
@@ -1243,6 +1247,25 @@ void xen_evtchn_do_upcall(struct pt_regs *regs)
set_irq_regs(old_regs);
}
+/*
+ * CONFIG_PREEMPT=n
On Fri, Jan 23, 2015 at 11:45:06AM +, David Vrabel wrote:
On 23/01/15 00:29, Luis R. Rodriguez wrote:
From: Luis R. Rodriguez mcg...@suse.com
Xen has support for splitting heavy work work into a series
of hypercalls, called multicalls, and preempting them through
what Xen calls
On Fri, Jan 23, 2015 at 11:45:06AM +, David Vrabel wrote:
+ */
+void xen_end_upcall(struct pt_regs *regs)
+{
+ if (xen_is_preemptible_hypercall(regs)) {
+ int cpuid = smp_processor_id();
+ if (_cond_resched())
+
On 23/01/15 00:29, Luis R. Rodriguez wrote:
From: Luis R. Rodriguez mcg...@suse.com
Xen has support for splitting heavy work work into a series
of hypercalls, called multicalls, and preempting them through
what Xen calls continuation [0]. Despite this though without
CONFIG_PREEMPT
On Thu, 22 Jan 2015 17:40:27 -0800
Andy Lutomirski l...@amacapital.net wrote:
+/*
+ * CONFIG_PREEMPT=n kernels can end up triggering the softlock
+ * TASK_UNINTERRUPTIBLE hanger check (default 120 seconds)
+ * when certain multicalls are used [0] on large systems, in
+ * that case we
From: Luis R. Rodriguez mcg...@suse.com
Xen has support for splitting heavy work work into a series
of hypercalls, called multicalls, and preempting them through
what Xen calls continuation [0]. Despite this though without
CONFIG_PREEMPT preemption won't happen, without preemption
a system can
On Thu, Jan 22, 2015 at 4:29 PM, Luis R. Rodriguez
mcg...@do-not-panic.com wrote:
From: Luis R. Rodriguez mcg...@suse.com
Xen has support for splitting heavy work work into a series
of hypercalls, called multicalls, and preempting them through
what Xen calls continuation [0]. Despite this
