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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-11-05 11:39:00 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-11-05 11:39:00 -0800
commit221d46841b931d0e6b11e6251e482f2afe3974dd (patch)
treefeb33999f71a84003f4ac752300c81f47f9e272f /arch
parent4d20826ffb6fa80c71b85d2cb858ae400a59a4d5 (diff)
parent633872b980f55f40a5e7de374f26970e41e2137b (diff)
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-lguest
* 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-lguest: lguest: tidy up documentation kernel/futex.c: make 3 functions static unexport access_process_vm lguest: make async_hcall() static
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/lguest/boot.c69
1 files changed, 34 insertions, 35 deletions
diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index a55b0902f9d..92c56117eae 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -93,38 +93,7 @@ struct lguest_data lguest_data = {
};
static cycle_t clock_base;
-/*G:035 Notice the lazy_hcall() above, rather than hcall(). This is our first
- * real optimization trick!
- *
- * When lazy_mode is set, it means we're allowed to defer all hypercalls and do
- * them as a batch when lazy_mode is eventually turned off. Because hypercalls
- * are reasonably expensive, batching them up makes sense. For example, a
- * large munmap might update dozens of page table entries: that code calls
- * paravirt_enter_lazy_mmu(), does the dozen updates, then calls
- * lguest_leave_lazy_mode().
- *
- * So, when we're in lazy mode, we call async_hypercall() to store the call for
- * future processing. When lazy mode is turned off we issue a hypercall to
- * flush the stored calls.
- */
-static void lguest_leave_lazy_mode(void)
-{
- paravirt_leave_lazy(paravirt_get_lazy_mode());
- hcall(LHCALL_FLUSH_ASYNC, 0, 0, 0);
-}
-
-static void lazy_hcall(unsigned long call,
- unsigned long arg1,
- unsigned long arg2,
- unsigned long arg3)
-{
- if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_NONE)
- hcall(call, arg1, arg2, arg3);
- else
- async_hcall(call, arg1, arg2, arg3);
-}
-
-/* async_hcall() is pretty simple: I'm quite proud of it really. We have a
+/*G:037 async_hcall() is pretty simple: I'm quite proud of it really. We have a
* ring buffer of stored hypercalls which the Host will run though next time we
* do a normal hypercall. Each entry in the ring has 4 slots for the hypercall
* arguments, and a "hcall_status" word which is 0 if the call is ready to go,
@@ -134,8 +103,8 @@ static void lazy_hcall(unsigned long call,
* full and we just make the hypercall directly. This has the nice side
* effect of causing the Host to run all the stored calls in the ring buffer
* which empties it for next time! */
-void async_hcall(unsigned long call,
- unsigned long arg1, unsigned long arg2, unsigned long arg3)
+static void async_hcall(unsigned long call, unsigned long arg1,
+ unsigned long arg2, unsigned long arg3)
{
/* Note: This code assumes we're uniprocessor. */
static unsigned int next_call;
@@ -161,7 +130,37 @@ void async_hcall(unsigned long call,
}
local_irq_restore(flags);
}
-/*:*/
+
+/*G:035 Notice the lazy_hcall() above, rather than hcall(). This is our first
+ * real optimization trick!
+ *
+ * When lazy_mode is set, it means we're allowed to defer all hypercalls and do
+ * them as a batch when lazy_mode is eventually turned off. Because hypercalls
+ * are reasonably expensive, batching them up makes sense. For example, a
+ * large munmap might update dozens of page table entries: that code calls
+ * paravirt_enter_lazy_mmu(), does the dozen updates, then calls
+ * lguest_leave_lazy_mode().
+ *
+ * So, when we're in lazy mode, we call async_hcall() to store the call for
+ * future processing. */
+static void lazy_hcall(unsigned long call,
+ unsigned long arg1,
+ unsigned long arg2,
+ unsigned long arg3)
+{
+ if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_NONE)
+ hcall(call, arg1, arg2, arg3);
+ else
+ async_hcall(call, arg1, arg2, arg3);
+}
+
+/* When lazy mode is turned off reset the per-cpu lazy mode variable and then
+ * issue a hypercall to flush any stored calls. */
+static void lguest_leave_lazy_mode(void)
+{
+ paravirt_leave_lazy(paravirt_get_lazy_mode());
+ hcall(LHCALL_FLUSH_ASYNC, 0, 0, 0);
+}
/*G:033
* After that diversion we return to our first native-instruction