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From c18e8f4bf7a628949f0d79facf91ddf6d07401e9 Mon Sep 17 00:00:00 2001
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From: Juan Quintela <quintela@redhat.com>
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Date: Tue, 14 Jan 2014 15:07:49 +0100
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Subject: [PATCH 38/40] memory: syncronize kvm bitmap using bitmaps operations
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RH-Author: Juan Quintela <quintela@redhat.com>
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Message-id: <1389712071-23303-39-git-send-email-quintela@redhat.com>
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Patchwork-id: 56693
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O-Subject: [RHEL7 qemu-kvm PATCH 38/40] memory: syncronize kvm bitmap using bitmaps operations
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Bugzilla: 997559
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Orit Wasserman <owasserm@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert (git) <dgilbert@redhat.com>
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If bitmaps are aligned properly, use bitmap operations. If they are
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not, just use old bit at a time code.
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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Reviewed-by: Orit Wasserman <owasserm@redhat.com>
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(cherry picked from commit ae2810c4bb3b383176e8e1b33931b16c01483aab)
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Signed-off-by: Juan Quintela <quintela@trasno.org>
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---
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include/exec/ram_addr.h | 54 ++++++++++++++++++++++++++++++++-----------------
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1 file changed, 36 insertions(+), 18 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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include/exec/ram_addr.h | 54 +++++++++++++++++++++++++++++++---------------
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1 files changed, 36 insertions(+), 18 deletions(-)
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diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
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index 9962e12..080a8b1 100644
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--- a/include/exec/ram_addr.h
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+++ b/include/exec/ram_addr.h
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@@ -82,29 +82,47 @@ static inline void cpu_physical_memory_set_dirty_lebitmap(unsigned long *bitmap,
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ram_addr_t start,
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ram_addr_t pages)
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{
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- unsigned int i, j;
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+ unsigned long i, j;
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unsigned long page_number, c;
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hwaddr addr;
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ram_addr_t ram_addr;
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- unsigned int len = (pages + HOST_LONG_BITS - 1) / HOST_LONG_BITS;
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+ unsigned long len = (pages + HOST_LONG_BITS - 1) / HOST_LONG_BITS;
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unsigned long hpratio = getpagesize() / TARGET_PAGE_SIZE;
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+ unsigned long page = BIT_WORD(start >> TARGET_PAGE_BITS);
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- /*
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- * bitmap-traveling is faster than memory-traveling (for addr...)
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- * especially when most of the memory is not dirty.
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- */
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- for (i = 0; i < len; i++) {
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- if (bitmap[i] != 0) {
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- c = leul_to_cpu(bitmap[i]);
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- do {
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- j = ffsl(c) - 1;
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- c &= ~(1ul << j);
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- page_number = (i * HOST_LONG_BITS + j) * hpratio;
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- addr = page_number * TARGET_PAGE_SIZE;
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- ram_addr = start + addr;
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- cpu_physical_memory_set_dirty_range(ram_addr,
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- TARGET_PAGE_SIZE * hpratio);
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- } while (c != 0);
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+ /* start address is aligned at the start of a word? */
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+ if (((page * BITS_PER_LONG) << TARGET_PAGE_BITS) == start) {
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+ long k;
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+ long nr = BITS_TO_LONGS(pages);
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+
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+ for (k = 0; k < nr; k++) {
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+ if (bitmap[k]) {
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+ unsigned long temp = leul_to_cpu(bitmap[k]);
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+
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+ ram_list.dirty_memory[DIRTY_MEMORY_MIGRATION][page + k] |= temp;
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+ ram_list.dirty_memory[DIRTY_MEMORY_VGA][page + k] |= temp;
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+ ram_list.dirty_memory[DIRTY_MEMORY_CODE][page + k] |= temp;
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+ }
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+ }
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+ xen_modified_memory(start, pages);
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+ } else {
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+ /*
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+ * bitmap-traveling is faster than memory-traveling (for addr...)
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+ * especially when most of the memory is not dirty.
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+ */
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+ for (i = 0; i < len; i++) {
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+ if (bitmap[i] != 0) {
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+ c = leul_to_cpu(bitmap[i]);
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+ do {
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+ j = ffsl(c) - 1;
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+ c &= ~(1ul << j);
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+ page_number = (i * HOST_LONG_BITS + j) * hpratio;
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+ addr = page_number * TARGET_PAGE_SIZE;
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+ ram_addr = start + addr;
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+ cpu_physical_memory_set_dirty_range(ram_addr,
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+ TARGET_PAGE_SIZE * hpratio);
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+ } while (c != 0);
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+ }
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}
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}
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}
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--
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1.7.1
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