From 8bafcb21643a39a5b29109f8bd5ee5a6f0f6850b Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Mon, 25 Jan 2016 15:13:47 +0100 Subject: [PATCH] memory: add early bail out from cpu_physical_memory_set_dirty_range 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 Signed-off-by: Paolo Bonzini --- include/exec/ram_addr.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h index 606e277092..f2e872d87a 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))) {