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[Qemu-devel] [PATCH 10/10] Maintaing number of dirty pages
From: |
Juan Quintela |
Subject: |
[Qemu-devel] [PATCH 10/10] Maintaing number of dirty pages |
Date: |
Wed, 24 Nov 2010 00:03:07 +0100 |
From: Juan Quintela <address@hidden>
Calculate the number of dirty pages takes a lot on hosts with lots
of memory. Just maintain how many pages are dirty. Only sync bitmaps
if number is small enough.
Signed-off-by: Juan Quintela <address@hidden>
Signed-off-by: Juan Quintela <address@hidden>
---
arch_init.c | 15 +--------------
cpu-all.h | 7 +++++++
exec.c | 1 +
3 files changed, 9 insertions(+), 14 deletions(-)
diff --git a/arch_init.c b/arch_init.c
index b463798..c2bc144 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -176,20 +176,7 @@ static uint64_t bytes_transferred;
static uint64_t ram_save_remaining(void)
{
- RAMBlock *block;
- uint64_t count = 0;
-
- QLIST_FOREACH(block, &ram_list.blocks, next) {
- ram_addr_t addr;
- for (addr = block->offset; addr < block->offset + block->length;
- addr += TARGET_PAGE_SIZE) {
- if (cpu_physical_memory_get_dirty(addr, MIGRATION_DIRTY_FLAG)) {
- count++;
- }
- }
- }
-
- return count;
+ return ram_list.dirty_pages;
}
uint64_t ram_bytes_remaining(void)
diff --git a/cpu-all.h b/cpu-all.h
index 30ae17d..5dc27c6 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -874,6 +874,7 @@ typedef struct RAMBlock {
typedef struct RAMList {
uint8_t *phys_dirty;
+ uint64_t dirty_pages;
QLIST_HEAD(ram, RAMBlock) blocks;
} RAMList;
extern RAMList ram_list;
@@ -922,6 +923,9 @@ static inline int cpu_physical_memory_get_dirty(ram_addr_t
addr,
static inline void cpu_physical_memory_set_dirty(ram_addr_t addr)
{
+ if (!cpu_physical_memory_get_dirty(addr, MIGRATION_DIRTY_FLAG))
+ ram_list.dirty_pages++;
+
ram_list.phys_dirty[addr >> TARGET_PAGE_BITS] = 0xff;
}
@@ -942,6 +946,9 @@ static inline void
cpu_physical_memory_mask_dirty_range(ram_addr_t start,
mask = ~dirty_flags;
p = ram_list.phys_dirty + (start >> TARGET_PAGE_BITS);
for (i = 0; i < len; i++) {
+ if (cpu_physical_memory_get_dirty(start + i * TARGET_PAGE_SIZE,
+ MIGRATION_DIRTY_FLAG & dirty_flags))
+ ram_list.dirty_pages--;
p[i] &= mask;
}
}
diff --git a/exec.c b/exec.c
index f5b2386..ca2506e 100644
--- a/exec.c
+++ b/exec.c
@@ -2866,6 +2866,7 @@ ram_addr_t qemu_ram_alloc_from_ptr(DeviceState *dev,
const char *name,
last_ram_offset() >> TARGET_PAGE_BITS);
memset(ram_list.phys_dirty + (new_block->offset >> TARGET_PAGE_BITS),
0xff, size >> TARGET_PAGE_BITS);
+ ram_list.dirty_pages += size >> TARGET_PAGE_BITS;
if (kvm_enabled())
kvm_setup_guest_memory(new_block->host, size);
--
1.7.3.2
- [Qemu-devel] Re: [PATCH 09/10] Exit loop if we have been there too long, (continued)
- [Qemu-devel] Re: [PATCH 09/10] Exit loop if we have been there too long, Avi Kivity, 2010/11/30
- [Qemu-devel] Re: [PATCH 09/10] Exit loop if we have been there too long, Anthony Liguori, 2010/11/30
- [Qemu-devel] Re: [PATCH 09/10] Exit loop if we have been there too long, Avi Kivity, 2010/11/30
- [Qemu-devel] Re: [PATCH 09/10] Exit loop if we have been there too long, Takuya Yoshikawa, 2010/11/30
- [Qemu-devel] Re: [PATCH 09/10] Exit loop if we have been there too long, Juan Quintela, 2010/11/30
- [Qemu-devel] Re: [PATCH 09/10] Exit loop if we have been there too long, Takuya Yoshikawa, 2010/11/30
- [Qemu-devel] Re: [PATCH 09/10] Exit loop if we have been there too long, Juan Quintela, 2010/11/30
- [Qemu-devel] Re: [PATCH 09/10] Exit loop if we have been there too long, Anthony Liguori, 2010/11/30
[Qemu-devel] [PATCH 10/10] Maintaing number of dirty pages,
Juan Quintela <=