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Re: [Qemu-devel] [PATCH 16/30] migration: move buffered_file.c code into
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH 16/30] migration: move buffered_file.c code into migration.c |
Date: |
Thu, 18 Oct 2012 10:57:22 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20121009 Thunderbird/16.0 |
Il 18/10/2012 09:30, Juan Quintela ha scritto:
> This only moves the code (also from buffered_file.h to migration.h).
> Fix whitespace until checkpatch is happy.
While I agree with this patch, it is also a conflict magnet. My
migration-in-a-coroutine cleanups will touch buffered_file.c, you're
warned...
Paolo
> Signed-off-by: Juan Quintela <address@hidden>
> ---
> Makefile.objs | 2 +-
> buffered_file.c | 244
> --------------------------------------------------------
> buffered_file.h | 22 -----
> migration.c | 218 +++++++++++++++++++++++++++++++++++++++++++++++++-
> migration.h | 1 +
> 5 files changed, 219 insertions(+), 268 deletions(-)
> delete mode 100644 buffered_file.c
> delete mode 100644 buffered_file.h
>
> diff --git a/Makefile.objs b/Makefile.objs
> index 74b3542..3de8f27 100644
> --- a/Makefile.objs
> +++ b/Makefile.objs
> @@ -73,7 +73,7 @@ extra-obj-$(CONFIG_LINUX) += fsdev/
>
> common-obj-y += tcg-runtime.o host-utils.o main-loop.o
> common-obj-y += input.o
> -common-obj-y += buffered_file.o migration.o migration-tcp.o
> +common-obj-y += migration.o migration-tcp.o
> common-obj-y += qemu-char.o #aio.o
> common-obj-y += block-migration.o iohandler.o
> common-obj-y += pflib.o
> diff --git a/buffered_file.c b/buffered_file.c
> deleted file mode 100644
> index c21f847..0000000
> --- a/buffered_file.c
> +++ /dev/null
> @@ -1,244 +0,0 @@
> -/*
> - * QEMU buffered QEMUFile
> - *
> - * Copyright IBM, Corp. 2008
> - *
> - * Authors:
> - * Anthony Liguori <address@hidden>
> - *
> - * This work is licensed under the terms of the GNU GPL, version 2. See
> - * the COPYING file in the top-level directory.
> - *
> - * Contributions after 2012-01-13 are licensed under the terms of the
> - * GNU GPL, version 2 or (at your option) any later version.
> - */
> -
> -#include "qemu-common.h"
> -#include "hw/hw.h"
> -#include "qemu-timer.h"
> -#include "qemu-char.h"
> -#include "buffered_file.h"
> -#include "qemu-thread.h"
> -
> -//#define DEBUG_BUFFERED_FILE
> -
> -typedef struct QEMUFileBuffered
> -{
> - MigrationState *migration_state;
> - QEMUFile *file;
> - size_t bytes_xfer;
> - size_t xfer_limit;
> - uint8_t *buffer;
> - size_t buffer_size;
> - size_t buffer_capacity;
> - QemuThread thread;
> -} QEMUFileBuffered;
> -
> -#ifdef DEBUG_BUFFERED_FILE
> -#define DPRINTF(fmt, ...) \
> - do { printf("buffered-file: " fmt, ## __VA_ARGS__); } while (0)
> -#else
> -#define DPRINTF(fmt, ...) \
> - do { } while (0)
> -#endif
> -
> -static ssize_t buffered_flush(QEMUFileBuffered *s)
> -{
> - size_t offset = 0;
> - ssize_t ret = 0;
> -
> - DPRINTF("flushing %zu byte(s) of data\n", s->buffer_size);
> -
> - while (s->bytes_xfer < s->xfer_limit && offset < s->buffer_size) {
> -
> - ret = migrate_fd_put_buffer(s->migration_state, s->buffer + offset,
> - s->buffer_size - offset);
> - if (ret <= 0) {
> - DPRINTF("error flushing data, %zd\n", ret);
> - break;
> - } else {
> - DPRINTF("flushed %zd byte(s)\n", ret);
> - offset += ret;
> - s->bytes_xfer += ret;
> - }
> - }
> -
> - DPRINTF("flushed %zu of %zu byte(s)\n", offset, s->buffer_size);
> - memmove(s->buffer, s->buffer + offset, s->buffer_size - offset);
> - s->buffer_size -= offset;
> -
> - if (ret < 0) {
> - return ret;
> - }
> - return offset;
> -}
> -
> -static int buffered_put_buffer(void *opaque, const uint8_t *buf, int64_t
> pos, int size)
> -{
> - QEMUFileBuffered *s = opaque;
> - ssize_t error;
> -
> - DPRINTF("putting %d bytes at %" PRId64 "\n", size, pos);
> -
> - error = qemu_file_get_error(s->file);
> - if (error) {
> - DPRINTF("flush when error, bailing: %s\n", strerror(-error));
> - return error;
> - }
> -
> - if (size <= 0) {
> - return size;
> - }
> -
> - if (size > (s->buffer_capacity - s->buffer_size)) {
> - DPRINTF("increasing buffer capacity from %zu by %zu\n",
> - s->buffer_capacity, size + 1024);
> -
> - s->buffer_capacity += size + 1024;
> -
> - s->buffer = g_realloc(s->buffer, s->buffer_capacity);
> - }
> -
> - memcpy(s->buffer + s->buffer_size, buf, size);
> - s->buffer_size += size;
> -
> - return size;
> -}
> -
> -static int buffered_close(void *opaque)
> -{
> - QEMUFileBuffered *s = opaque;
> - ssize_t ret = 0;
> - int ret2;
> -
> - DPRINTF("closing\n");
> -
> - s->xfer_limit = INT_MAX;
> - while (!qemu_file_get_error(s->file) && s->buffer_size) {
> - ret = buffered_flush(s);
> - if (ret < 0) {
> - break;
> - }
> - }
> -
> - ret2 = migrate_fd_close(s->migration_state);
> - if (ret >= 0) {
> - ret = ret2;
> - }
> - ret = migrate_fd_close(s->migration_state);
> - s->migration_state->complete = true;
> - return ret;
> -}
> -
> -/*
> - * The meaning of the return values is:
> - * 0: We can continue sending
> - * 1: Time to stop
> - * negative: There has been an error
> - */
> -static int buffered_rate_limit(void *opaque)
> -{
> - QEMUFileBuffered *s = opaque;
> - int ret;
> -
> - ret = qemu_file_get_error(s->file);
> - if (ret) {
> - return ret;
> - }
> -
> - if (s->bytes_xfer > s->xfer_limit)
> - return 1;
> -
> - return 0;
> -}
> -
> -static int64_t buffered_set_rate_limit(void *opaque, int64_t new_rate)
> -{
> - QEMUFileBuffered *s = opaque;
> - if (qemu_file_get_error(s->file)) {
> - goto out;
> - }
> - if (new_rate > SIZE_MAX) {
> - new_rate = SIZE_MAX;
> - }
> -
> - s->xfer_limit = new_rate / 10;
> -
> -out:
> - return s->xfer_limit;
> -}
> -
> -static int64_t buffered_get_rate_limit(void *opaque)
> -{
> - QEMUFileBuffered *s = opaque;
> -
> - return s->xfer_limit;
> -}
> -
> -/* 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 initial_time = qemu_get_clock_ms(rt_clock);
> - int64_t max_size = 0;
> - bool last_round = false;
> -
> - while (true) {
> - int64_t current_time = qemu_get_clock_ms(rt_clock);
> -
> - if (s->migration_state->complete) {
> - break;
> - }
> - if (current_time >= initial_time + BUFFER_DELAY) {
> - uint64_t transferred_bytes = s->bytes_xfer;
> - uint64_t time_spent = current_time - initial_time;
> - double bandwidth = transferred_bytes / time_spent;
> - max_size = bandwidth * migrate_max_downtime() / 1000000;
> -
> - DPRINTF("transferred %" PRIu64 " time_spent %" PRIu64
> - " bandwidth %g max_size %" PRId64 "\n",
> - transferred_bytes, time_spent, bandwidth, max_size);
> -
> - s->bytes_xfer = 0;
> - initial_time = current_time;
> - }
> - if (!last_round && (s->bytes_xfer >= s->xfer_limit)) {
> - /* usleep expects microseconds */
> - usleep((initial_time + BUFFER_DELAY - current_time)*1000);
> - }
> - buffered_flush(s);
> -
> - DPRINTF("file is ready\n");
> - if (s->bytes_xfer < s->xfer_limit) {
> - DPRINTF("notifying client\n");
> - last_round = migrate_fd_put_ready(s->migration_state, max_size);
> - }
> - }
> -
> - g_free(s->buffer);
> - g_free(s);
> - return NULL;
> -}
> -
> -void qemu_fopen_ops_buffered(MigrationState *migration_state)
> -{
> - QEMUFileBuffered *s;
> -
> - s = g_malloc0(sizeof(*s));
> -
> - s->migration_state = migration_state;
> - s->xfer_limit = migration_state->bandwidth_limit / 10;
> - s->migration_state->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);
> -
> - migration_state->file = s->file;
> -
> - qemu_thread_create(&s->thread, buffered_file_thread, s,
> - QEMU_THREAD_DETACHED);
> -}
> diff --git a/buffered_file.h b/buffered_file.h
> deleted file mode 100644
> index 8a246fd..0000000
> --- a/buffered_file.h
> +++ /dev/null
> @@ -1,22 +0,0 @@
> -/*
> - * QEMU buffered QEMUFile
> - *
> - * Copyright IBM, Corp. 2008
> - *
> - * Authors:
> - * Anthony Liguori <address@hidden>
> - *
> - * This work is licensed under the terms of the GNU GPL, version 2. See
> - * the COPYING file in the top-level directory.
> - *
> - */
> -
> -#ifndef QEMU_BUFFERED_FILE_H
> -#define QEMU_BUFFERED_FILE_H
> -
> -#include "hw/hw.h"
> -#include "migration.h"
> -
> -void qemu_fopen_ops_buffered(MigrationState *migration_state);
> -
> -#endif
> diff --git a/migration.c b/migration.c
> index 8054a77..b1567f3 100644
> --- a/migration.c
> +++ b/migration.c
> @@ -16,7 +16,7 @@
> #include "qemu-common.h"
> #include "migration.h"
> #include "monitor.h"
> -#include "buffered_file.h"
> +#include "qemu-file.h"
> #include "sysemu.h"
> #include "block.h"
> #include "qemu_socket.h"
> @@ -569,3 +569,219 @@ int64_t migrate_xbzrle_cache_size(void)
>
> return s->xbzrle_cache_size;
> }
> +
> +/* migration thread support */
> +
> +typedef struct QEMUFileBuffered {
> + MigrationState *migration_state;
> + QEMUFile *file;
> + size_t bytes_xfer;
> + size_t xfer_limit;
> + uint8_t *buffer;
> + size_t buffer_size;
> + size_t buffer_capacity;
> + QemuThread thread;
> +} QEMUFileBuffered;
> +
> +static ssize_t buffered_flush(QEMUFileBuffered *s)
> +{
> + size_t offset = 0;
> + ssize_t ret = 0;
> +
> + DPRINTF("flushing %zu byte(s) of data\n", s->buffer_size);
> +
> + while (s->bytes_xfer < s->xfer_limit && offset < s->buffer_size) {
> +
> + ret = migrate_fd_put_buffer(s->migration_state, s->buffer + offset,
> + s->buffer_size - offset);
> + if (ret <= 0) {
> + DPRINTF("error flushing data, %zd\n", ret);
> + break;
> + } else {
> + DPRINTF("flushed %zd byte(s)\n", ret);
> + offset += ret;
> + s->bytes_xfer += ret;
> + }
> + }
> +
> + DPRINTF("flushed %zu of %zu byte(s)\n", offset, s->buffer_size);
> + memmove(s->buffer, s->buffer + offset, s->buffer_size - offset);
> + s->buffer_size -= offset;
> +
> + if (ret < 0) {
> + return ret;
> + }
> + return offset;
> +}
> +
> +static int buffered_put_buffer(void *opaque, const uint8_t *buf,
> + int64_t pos, int size)
> +{
> + QEMUFileBuffered *s = opaque;
> + ssize_t error;
> +
> + DPRINTF("putting %d bytes at %" PRId64 "\n", size, pos);
> +
> + error = qemu_file_get_error(s->file);
> + if (error) {
> + DPRINTF("flush when error, bailing: %s\n", strerror(-error));
> + return error;
> + }
> +
> + if (size <= 0) {
> + return size;
> + }
> +
> + if (size > (s->buffer_capacity - s->buffer_size)) {
> + DPRINTF("increasing buffer capacity from %zu by %zu\n",
> + s->buffer_capacity, size + 1024);
> +
> + s->buffer_capacity += size + 1024;
> +
> + s->buffer = g_realloc(s->buffer, s->buffer_capacity);
> + }
> +
> + memcpy(s->buffer + s->buffer_size, buf, size);
> + s->buffer_size += size;
> +
> + return size;
> +}
> +
> +static int buffered_close(void *opaque)
> +{
> + QEMUFileBuffered *s = opaque;
> + ssize_t ret = 0;
> + int ret2;
> +
> + DPRINTF("closing\n");
> +
> + s->xfer_limit = INT_MAX;
> + while (!qemu_file_get_error(s->file) && s->buffer_size) {
> + ret = buffered_flush(s);
> + if (ret < 0) {
> + break;
> + }
> + }
> +
> + ret2 = migrate_fd_close(s->migration_state);
> + if (ret >= 0) {
> + ret = ret2;
> + }
> + ret = migrate_fd_close(s->migration_state);
> + s->migration_state->complete = true;
> + return ret;
> +}
> +
> +/*
> + * The meaning of the return values is:
> + * 0: We can continue sending
> + * 1: Time to stop
> + * negative: There has been an error
> + */
> +static int buffered_rate_limit(void *opaque)
> +{
> + QEMUFileBuffered *s = opaque;
> + int ret;
> +
> + ret = qemu_file_get_error(s->file);
> + if (ret) {
> + return ret;
> + }
> +
> + if (s->bytes_xfer > s->xfer_limit) {
> + return 1;
> + }
> +
> + return 0;
> +}
> +
> +static int64_t buffered_set_rate_limit(void *opaque, int64_t new_rate)
> +{
> + QEMUFileBuffered *s = opaque;
> + if (qemu_file_get_error(s->file)) {
> + goto out;
> + }
> + if (new_rate > SIZE_MAX) {
> + new_rate = SIZE_MAX;
> + }
> +
> + s->xfer_limit = new_rate / 10;
> +
> +out:
> + return s->xfer_limit;
> +}
> +
> +static int64_t buffered_get_rate_limit(void *opaque)
> +{
> + QEMUFileBuffered *s = opaque;
> +
> + return s->xfer_limit;
> +}
> +
> +/* 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 initial_time = qemu_get_clock_ms(rt_clock);
> + int64_t max_size = 0;
> + bool last_round = false;
> +
> + while (true) {
> + int64_t current_time = qemu_get_clock_ms(rt_clock);
> +
> + if (s->migration_state->complete) {
> + break;
> + }
> + if (current_time >= initial_time + BUFFER_DELAY) {
> + uint64_t transferred_bytes = s->bytes_xfer;
> + uint64_t time_spent = current_time - initial_time;
> + double bandwidth = transferred_bytes / time_spent;
> + max_size = bandwidth * migrate_max_downtime() / 1000000;
> +
> + DPRINTF("transferred %" PRIu64 " time_spent %" PRIu64
> + " bandwidth %g max_size %" PRId64 "\n",
> + transferred_bytes, time_spent, bandwidth, max_size);
> +
> + s->bytes_xfer = 0;
> + initial_time = current_time;
> + }
> + if (!last_round && (s->bytes_xfer >= s->xfer_limit)) {
> + /* usleep expects microseconds */
> + usleep((initial_time + BUFFER_DELAY - current_time)*1000);
> + }
> + buffered_flush(s);
> +
> + DPRINTF("file is ready\n");
> + if (s->bytes_xfer < s->xfer_limit) {
> + DPRINTF("notifying client\n");
> + last_round = migrate_fd_put_ready(s->migration_state, max_size);
> + }
> + }
> +
> + g_free(s->buffer);
> + g_free(s);
> + return NULL;
> +}
> +
> +void qemu_fopen_ops_buffered(MigrationState *migration_state)
> +{
> + QEMUFileBuffered *s;
> +
> + s = g_malloc0(sizeof(*s));
> +
> + s->migration_state = migration_state;
> + s->xfer_limit = migration_state->bandwidth_limit / 10;
> + s->migration_state->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);
> +
> + migration_state->file = s->file;
> +
> + qemu_thread_create(&s->thread, buffered_file_thread, s,
> + QEMU_THREAD_DETACHED);
> +}
> diff --git a/migration.h b/migration.h
> index 1f2baed..40c8e9c 100644
> --- a/migration.h
> +++ b/migration.h
> @@ -129,4 +129,5 @@ int64_t migrate_xbzrle_cache_size(void);
>
> int64_t xbzrle_cache_resize(int64_t new_size);
>
> +void qemu_fopen_ops_buffered(MigrationState *migration_state);
> #endif
>
- [Qemu-devel] [PATCH 11/30] buffered_file: don't flush on put buffer, (continued)
- [Qemu-devel] [PATCH 11/30] buffered_file: don't flush on put buffer, Juan Quintela, 2012/10/18
- [Qemu-devel] [PATCH 12/30] buffered_file: unfold buffered_append in buffered_put_buffer, Juan Quintela, 2012/10/18
- [Qemu-devel] [PATCH 18/30] migration: Inline qemu_fopen_ops_buffered into migrate_fd_connect, Juan Quintela, 2012/10/18
- [Qemu-devel] [PATCH 05/30] migration: make qemu_fopen_ops_buffered() return void, Juan Quintela, 2012/10/18
- [Qemu-devel] [PATCH 17/30] migration: move migration_fd_put_ready(), Juan Quintela, 2012/10/18
- [Qemu-devel] [PATCH 19/30] migration: move migration notifier, Juan Quintela, 2012/10/18
- [Qemu-devel] [PATCH 15/30] migration-fd: remove duplicate include, Juan Quintela, 2012/10/18
- [Qemu-devel] [PATCH 23/30] migration: print times for end phase, Juan Quintela, 2012/10/18
- [Qemu-devel] [PATCH 16/30] migration: move buffered_file.c code into migration.c, Juan Quintela, 2012/10/18
- Re: [Qemu-devel] [PATCH 16/30] migration: move buffered_file.c code into migration.c,
Paolo Bonzini <=
- [Qemu-devel] [PATCH 24/30] ram: rename last_block to last_seen_block, Juan Quintela, 2012/10/18
- [Qemu-devel] [PATCH 22/30] migration: unfold rest of migrate_fd_put_ready() into thread, Juan Quintela, 2012/10/18
- [Qemu-devel] [PATCH 21/30] migration: move exit condition to migration thread, Juan Quintela, 2012/10/18
[Qemu-devel] [PATCH 20/30] migration: move begining stage to the migration thread, Juan Quintela, 2012/10/18
[Qemu-devel] [PATCH 29/30] migration: Only go to the iterate stage if there is anything to send, Juan Quintela, 2012/10/18
[Qemu-devel] [PATCH 27/30] ram: Use memory_region_test_and_clear_dirty, Juan Quintela, 2012/10/18