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[PULL,01/28] memory: add early bail out from cpu_physical_memory_set_dirty_range

Message ID 1454950999-64128-2-git-send-email-pbonzini@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Paolo Bonzini Feb. 8, 2016, 5:02 p.m. UTC 
This condition is true in the common case, so we can cut out the body of
the function.  In addition, this makes it easier for the compiler to do
at least partial inlining, even if it decides that fully inlining the
function is unreasonable.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 include/exec/ram_addr.h | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
index 606e277..f2e872d 100644
--- a/include/exec/ram_addr.h
+++ b/include/exec/ram_addr.h
@@ -165,6 +165,10 @@  static inline void cpu_physical_memory_set_dirty_range(ram_addr_t start,
     unsigned long end, page;
     unsigned long **d = ram_list.dirty_memory;
 
+    if (!mask && !xen_enabled()) {
+        return;
+    }
+
     end = TARGET_PAGE_ALIGN(start + length) >> TARGET_PAGE_BITS;
     page = start >> TARGET_PAGE_BITS;
     if (likely(mask & (1 << DIRTY_MEMORY_MIGRATION))) {