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[Qemu-devel] [PATCH 04/18] buffered_file: Move from using a timer to use
From: |
Juan Quintela |
Subject: |
[Qemu-devel] [PATCH 04/18] buffered_file: Move from using a timer to use a thread |
Date: |
Mon, 29 Oct 2012 15:11:29 +0100 |
We still protect everything except the wait with the iothread lock.
But we moved from a timer to a thread. Steps one by one.
We also need to detect when we have finished with a variable "complete".
Signed-off-by: Juan Quintela <address@hidden>
---
buffered_file.c | 58 +++++++++++++++++++++++++++++++++++----------------------
1 file changed, 36 insertions(+), 22 deletions(-)
diff --git a/buffered_file.c b/buffered_file.c
index ed92df1..ec7abc6 100644
--- a/buffered_file.c
+++ b/buffered_file.c
@@ -18,6 +18,7 @@
#include "qemu-timer.h"
#include "qemu-char.h"
#include "buffered_file.h"
+#include "qemu-thread.h"
//#define DEBUG_BUFFERED_FILE
@@ -31,7 +32,8 @@ typedef struct QEMUFileBuffered
uint8_t *buffer;
size_t buffer_size;
size_t buffer_capacity;
- QEMUTimer *timer;
+ QemuThread thread;
+ bool complete;
} QEMUFileBuffered;
#ifdef DEBUG_BUFFERED_FILE
@@ -160,11 +162,8 @@ static int buffered_close(void *opaque)
if (ret >= 0) {
ret = ret2;
}
- qemu_del_timer(s->timer);
- qemu_free_timer(s->timer);
- g_free(s->buffer);
- g_free(s);
-
+ ret = migrate_fd_close(s->migration_state);
+ s->complete = true;
return ret;
}
@@ -215,23 +214,38 @@ static int64_t buffered_get_rate_limit(void *opaque)
return s->xfer_limit;
}
-static void buffered_rate_tick(void *opaque)
+/* 100ms xfer_limit is the limit that we should write each 100ms */
+#define BUFFER_DELAY 100
+
+static void *buffered_file_thread(void *opaque)
{
QEMUFileBuffered *s = opaque;
+ int64_t expire_time = qemu_get_clock_ms(rt_clock) + BUFFER_DELAY;
- if (qemu_file_get_error(s->file)) {
- buffered_close(s);
- return;
- }
-
- qemu_mod_timer(s->timer, qemu_get_clock_ms(rt_clock) + 100);
-
- if (s->freeze_output)
- return;
-
- s->bytes_xfer = 0;
+ while (true) {
+ int64_t current_time = qemu_get_clock_ms(rt_clock);
- buffered_put_buffer(s, NULL, 0, 0);
+ if (s->complete) {
+ break;
+ }
+ if (s->freeze_output) {
+ continue;
+ }
+ if (current_time >= expire_time) {
+ s->bytes_xfer = 0;
+ expire_time = current_time + BUFFER_DELAY;
+ }
+ if (s->bytes_xfer >= s->xfer_limit) {
+ /* usleep expects microseconds */
+ g_usleep((expire_time - current_time)*1000);
+ }
+ qemu_mutex_lock_iothread();
+ buffered_put_buffer(s, NULL, 0, 0);
+ qemu_mutex_unlock_iothread();
+ }
+ g_free(s->buffer);
+ g_free(s);
+ return NULL;
}
QEMUFile *qemu_fopen_ops_buffered(MigrationState *migration_state)
@@ -242,15 +256,15 @@ QEMUFile *qemu_fopen_ops_buffered(MigrationState
*migration_state)
s->migration_state = migration_state;
s->xfer_limit = migration_state->bandwidth_limit / 10;
+ s->complete = false;
s->file = qemu_fopen_ops(s, buffered_put_buffer, NULL,
buffered_close, buffered_rate_limit,
buffered_set_rate_limit,
buffered_get_rate_limit);
- s->timer = qemu_new_timer_ms(rt_clock, buffered_rate_tick, s);
-
- qemu_mod_timer(s->timer, qemu_get_clock_ms(rt_clock) + 100);
+ qemu_thread_create(&s->thread, buffered_file_thread, s,
+ QEMU_THREAD_DETACHED);
return s->file;
}
--
1.7.11.7
- [Qemu-devel] [PATCH 00/18] Migration thread lite (20121029), Juan Quintela, 2012/10/29
- [Qemu-devel] [PATCH 01/18] split MRU ram list, Juan Quintela, 2012/10/29
- [Qemu-devel] [PATCH 04/18] buffered_file: Move from using a timer to use a thread,
Juan Quintela <=
- [Qemu-devel] [PATCH 05/18] migration: make qemu_fopen_ops_buffered() return void, Juan Quintela, 2012/10/29
- [Qemu-devel] [PATCH 06/18] migration: stop all cpus correctly, Juan Quintela, 2012/10/29
- [Qemu-devel] [PATCH 02/18] add a version number to ram_list, Juan Quintela, 2012/10/29
- [Qemu-devel] [PATCH 03/18] protect the ramlist with a separate mutex, Juan Quintela, 2012/10/29
- [Qemu-devel] [PATCH 09/18] migration: take finer locking, Juan Quintela, 2012/10/29
- [Qemu-devel] [PATCH 07/18] migration: make writes blocking, Juan Quintela, 2012/10/29