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[Qemu-devel] [PATCH 09/10] Exit loop if we have been there too long
From: |
Juan Quintela |
Subject: |
[Qemu-devel] [PATCH 09/10] Exit loop if we have been there too long |
Date: |
Wed, 24 Nov 2010 00:03:06 +0100 |
From: Juan Quintela <address@hidden>
cheking each 64 pages is a random magic number as good as any other.
We don't want to test too many times, but on the other hand,
qemu_get_clock_ns() is not so expensive either.
Signed-off-by: Juan Quintela <address@hidden>
Signed-off-by: Juan Quintela <address@hidden>
---
arch_init.c | 16 ++++++++++++++++
1 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/arch_init.c b/arch_init.c
index d32aaae..b463798 100644
--- a/arch_init.c
+++ b/arch_init.c
@@ -40,6 +40,7 @@
#include "net.h"
#include "gdbstub.h"
#include "hw/smbios.h"
+#include "buffered_file.h"
#ifdef TARGET_SPARC
int graphic_width = 1024;
@@ -218,6 +219,7 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage,
void *opaque)
uint64_t bytes_transferred_last;
uint64_t t0;
double bwidth = 0;
+ int i;
if (stage < 0) {
cpu_physical_memory_set_dirty_tracking(0);
@@ -261,6 +263,7 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage,
void *opaque)
bytes_transferred_last = bytes_transferred;
t0 = qemu_get_clock_ns(rt_clock);
+ i = 0;
while (!qemu_file_rate_limit(f)) {
int bytes_sent;
@@ -269,6 +272,19 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage,
void *opaque)
if (bytes_sent == 0) { /* no more blocks */
break;
}
+ /* we want to check in the 1st loop, just in case it was the 1st time
+ and we had to sync the dirty bitmap.
+ qemu_get_clock_ns() is a bit expensive, so we only check each some
+ iterations
+ */
+ if ((i & 63) == 0) {
+ uint64_t t1 = (qemu_get_clock_ns(rt_clock) - t0) / 1000000;
+ if (t1 > buffered_file_interval/2) {
+ printf("big delay %ld milliseconds, %d iterations\n", t1, i);
+ break;
+ }
+ }
+ i++;
}
t0 = qemu_get_clock_ns(rt_clock) - t0;
--
1.7.3.2
[Qemu-devel] [PATCH 08/10] Count nanoseconds with uint64_t not doubles, Juan Quintela, 2010/11/23
[Qemu-devel] [PATCH 09/10] Exit loop if we have been there too long,
Juan Quintela <=
- [Qemu-devel] Re: [PATCH 09/10] Exit loop if we have been there too long, Michael S. Tsirkin, 2010/11/24
- [Qemu-devel] Re: [PATCH 09/10] Exit loop if we have been there too long, Juan Quintela, 2010/11/24
- [Qemu-devel] Re: [PATCH 09/10] Exit loop if we have been there too long, Michael S. Tsirkin, 2010/11/24
- [Qemu-devel] Re: [PATCH 09/10] Exit loop if we have been there too long, Paolo Bonzini, 2010/11/24
- [Qemu-devel] Re: [PATCH 09/10] Exit loop if we have been there too long, Michael S. Tsirkin, 2010/11/24
- Message not available
- [Qemu-devel] Re: [PATCH 09/10] Exit loop if we have been there too long, Juan Quintela, 2010/11/30
Message not available