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authorJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2010-12-16 14:33:27 -0800
committerJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2011-07-18 15:43:26 -0700
commitc796f213a6934712ede728d9b53ef0e5066db23a (patch)
tree30fffcabfad42297b2d4b1f455a5f88ccf91091b /arch/x86/xen/multicalls.c
parentf04e2ee41d3dbeb6eeb3685d1b4c208b898e278f (diff)
xen/trace: add multicall tracing
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Diffstat (limited to 'arch/x86/xen/multicalls.c')
-rw-r--r--arch/x86/xen/multicalls.c31
1 files changed, 23 insertions, 8 deletions
diff --git a/arch/x86/xen/multicalls.c b/arch/x86/xen/multicalls.c
index b9bf19884bc..7074c7ebfff 100644
--- a/arch/x86/xen/multicalls.c
+++ b/arch/x86/xen/multicalls.c
@@ -65,6 +65,8 @@ void xen_mc_flush(void)
something in the middle */
local_irq_save(flags);
+ trace_xen_mc_flush(b->mcidx, b->argidx, b->cbidx);
+
if (b->mcidx) {
#if MC_DEBUG
memcpy(b->debug, b->entries,
@@ -116,11 +118,15 @@ struct multicall_space __xen_mc_entry(size_t args)
struct multicall_space ret;
unsigned argidx = roundup(b->argidx, sizeof(u64));
+ trace_xen_mc_entry_alloc(args);
+
BUG_ON(preemptible());
BUG_ON(b->argidx >= MC_ARGS);
if (b->mcidx == MC_BATCH ||
(argidx + args) >= MC_ARGS) {
+ trace_xen_mc_flush_reason((b->mcidx == MC_BATCH) ?
+ XEN_MC_FL_BATCH : XEN_MC_FL_ARGS);
xen_mc_flush();
argidx = roundup(b->argidx, sizeof(u64));
}
@@ -145,20 +151,25 @@ struct multicall_space xen_mc_extend_args(unsigned long op, size_t size)
BUG_ON(preemptible());
BUG_ON(b->argidx >= MC_ARGS);
- if (b->mcidx == 0)
- return ret;
-
- if (b->entries[b->mcidx - 1].op != op)
- return ret;
+ if (unlikely(b->mcidx == 0 ||
+ b->entries[b->mcidx - 1].op != op)) {
+ trace_xen_mc_extend_args(op, size, XEN_MC_XE_BAD_OP);
+ goto out;
+ }
- if ((b->argidx + size) >= MC_ARGS)
- return ret;
+ if (unlikely((b->argidx + size) >= MC_ARGS)) {
+ trace_xen_mc_extend_args(op, size, XEN_MC_XE_NO_SPACE);
+ goto out;
+ }
ret.mc = &b->entries[b->mcidx - 1];
ret.args = &b->args[b->argidx];
b->argidx += size;
BUG_ON(b->argidx >= MC_ARGS);
+
+ trace_xen_mc_extend_args(op, size, XEN_MC_XE_OK);
+out:
return ret;
}
@@ -167,8 +178,12 @@ void xen_mc_callback(void (*fn)(void *), void *data)
struct mc_buffer *b = &__get_cpu_var(mc_buffer);
struct callback *cb;
- if (b->cbidx == MC_BATCH)
+ if (b->cbidx == MC_BATCH) {
+ trace_xen_mc_flush_reason(XEN_MC_FL_CALLBACK);
xen_mc_flush();
+ }
+
+ trace_xen_mc_callback(fn, data);
cb = &b->callbacks[b->cbidx++];
cb->fn = fn;