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![Sascha Silbe](/assets/img/avatar_default.png)
ratelimit_calculate_delay() previously reset the accounting every time slice, no matter how much data had been processed before. This had (at least) two consequences: 1. The minimum speed is rather large, e.g. 5 MiB/s for commit and stream. Not sure if there are real-world use cases where this would be a problem. Mirroring and backup over a slow link (e.g. DSL) would come to mind, though. 2. Tests for block job operations (e.g. cancel) were rather racy All block jobs currently use a time slice of 100ms. That's a reasonable value to get smooth output during regular operation. However this also meant that the state of block jobs changed every 100ms, no matter how low the configured limit was. On busy hosts, qemu often transferred additional chunks until the test case had a chance to cancel the job. Fix the block job rate limit code to delay for more than one time slice to address the above issues. To make it easier to handle oversized chunks we switch the semantics from returning a delay _before_ the current request to a delay _after_ the current request. If necessary, this delay consists of multiple time slice units. Since the mirror job sends multiple chunks in one go even if the rate limit was exceeded in between, we need to keep track of the start of the current time slice so we can correctly re-compute the delay for the updated amount of data. The minimum bandwidth now is 1 data unit per time slice. The block jobs are currently passing the amount of data transferred in sectors and using 100ms time slices, so this translates to 5120 bytes/second. With chunk sizes usually being O(512KiB), tests have plenty of time (O(100s)) to operate on block jobs. The chance of a race condition now is fairly remote, except possibly on insanely loaded systems. Signed-off-by: Sascha Silbe <silbe@linux.vnet.ibm.com> Message-id: 1467127721-9564-2-git-send-email-silbe@linux.vnet.ibm.com Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
238 lines
6.7 KiB
C
238 lines
6.7 KiB
C
/*
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* Image streaming
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*
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* Copyright IBM, Corp. 2011
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*
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* Authors:
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* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "trace.h"
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#include "block/block_int.h"
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#include "block/blockjob.h"
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#include "qapi/error.h"
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#include "qapi/qmp/qerror.h"
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#include "qemu/ratelimit.h"
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#include "sysemu/block-backend.h"
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enum {
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/*
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* Size of data buffer for populating the image file. This should be large
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* enough to process multiple clusters in a single call, so that populating
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* contiguous regions of the image is efficient.
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*/
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STREAM_BUFFER_SIZE = 512 * 1024, /* in bytes */
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};
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#define SLICE_TIME 100000000ULL /* ns */
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typedef struct StreamBlockJob {
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BlockJob common;
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RateLimit limit;
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BlockDriverState *base;
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BlockdevOnError on_error;
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char *backing_file_str;
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} StreamBlockJob;
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static int coroutine_fn stream_populate(BlockBackend *blk,
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int64_t sector_num, int nb_sectors,
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void *buf)
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{
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struct iovec iov = {
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.iov_base = buf,
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.iov_len = nb_sectors * BDRV_SECTOR_SIZE,
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};
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QEMUIOVector qiov;
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qemu_iovec_init_external(&qiov, &iov, 1);
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/* Copy-on-read the unallocated clusters */
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return blk_co_preadv(blk, sector_num * BDRV_SECTOR_SIZE, qiov.size, &qiov,
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BDRV_REQ_COPY_ON_READ);
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}
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typedef struct {
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int ret;
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bool reached_end;
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} StreamCompleteData;
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static void stream_complete(BlockJob *job, void *opaque)
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{
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StreamBlockJob *s = container_of(job, StreamBlockJob, common);
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StreamCompleteData *data = opaque;
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BlockDriverState *bs = blk_bs(job->blk);
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BlockDriverState *base = s->base;
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if (!block_job_is_cancelled(&s->common) && data->reached_end &&
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data->ret == 0) {
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const char *base_id = NULL, *base_fmt = NULL;
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if (base) {
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base_id = s->backing_file_str;
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if (base->drv) {
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base_fmt = base->drv->format_name;
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}
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}
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data->ret = bdrv_change_backing_file(bs, base_id, base_fmt);
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bdrv_set_backing_hd(bs, base);
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}
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g_free(s->backing_file_str);
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block_job_completed(&s->common, data->ret);
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g_free(data);
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}
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static void coroutine_fn stream_run(void *opaque)
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{
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StreamBlockJob *s = opaque;
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StreamCompleteData *data;
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BlockBackend *blk = s->common.blk;
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BlockDriverState *bs = blk_bs(blk);
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BlockDriverState *base = s->base;
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int64_t sector_num = 0;
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int64_t end = -1;
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uint64_t delay_ns = 0;
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int error = 0;
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int ret = 0;
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int n = 0;
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void *buf;
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if (!bs->backing) {
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goto out;
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}
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s->common.len = bdrv_getlength(bs);
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if (s->common.len < 0) {
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ret = s->common.len;
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goto out;
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}
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end = s->common.len >> BDRV_SECTOR_BITS;
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buf = qemu_blockalign(bs, STREAM_BUFFER_SIZE);
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/* Turn on copy-on-read for the whole block device so that guest read
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* requests help us make progress. Only do this when copying the entire
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* backing chain since the copy-on-read operation does not take base into
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* account.
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*/
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if (!base) {
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bdrv_enable_copy_on_read(bs);
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}
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for (sector_num = 0; sector_num < end; sector_num += n) {
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bool copy;
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/* Note that even when no rate limit is applied we need to yield
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* with no pending I/O here so that bdrv_drain_all() returns.
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*/
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block_job_sleep_ns(&s->common, QEMU_CLOCK_REALTIME, delay_ns);
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if (block_job_is_cancelled(&s->common)) {
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break;
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}
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copy = false;
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ret = bdrv_is_allocated(bs, sector_num,
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STREAM_BUFFER_SIZE / BDRV_SECTOR_SIZE, &n);
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if (ret == 1) {
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/* Allocated in the top, no need to copy. */
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} else if (ret >= 0) {
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/* Copy if allocated in the intermediate images. Limit to the
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* known-unallocated area [sector_num, sector_num+n). */
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ret = bdrv_is_allocated_above(backing_bs(bs), base,
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sector_num, n, &n);
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/* Finish early if end of backing file has been reached */
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if (ret == 0 && n == 0) {
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n = end - sector_num;
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}
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copy = (ret == 1);
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}
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trace_stream_one_iteration(s, sector_num, n, ret);
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if (copy) {
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ret = stream_populate(blk, sector_num, n, buf);
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}
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if (ret < 0) {
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BlockErrorAction action =
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block_job_error_action(&s->common, s->on_error, true, -ret);
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if (action == BLOCK_ERROR_ACTION_STOP) {
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n = 0;
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continue;
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}
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if (error == 0) {
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error = ret;
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}
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if (action == BLOCK_ERROR_ACTION_REPORT) {
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break;
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}
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}
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ret = 0;
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/* Publish progress */
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s->common.offset += n * BDRV_SECTOR_SIZE;
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if (copy && s->common.speed) {
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delay_ns = ratelimit_calculate_delay(&s->limit, n);
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}
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}
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if (!base) {
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bdrv_disable_copy_on_read(bs);
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}
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/* Do not remove the backing file if an error was there but ignored. */
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ret = error;
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qemu_vfree(buf);
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out:
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/* Modify backing chain and close BDSes in main loop */
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data = g_malloc(sizeof(*data));
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data->ret = ret;
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data->reached_end = sector_num == end;
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block_job_defer_to_main_loop(&s->common, stream_complete, data);
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}
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static void stream_set_speed(BlockJob *job, int64_t speed, Error **errp)
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{
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StreamBlockJob *s = container_of(job, StreamBlockJob, common);
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if (speed < 0) {
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error_setg(errp, QERR_INVALID_PARAMETER, "speed");
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return;
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}
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ratelimit_set_speed(&s->limit, speed / BDRV_SECTOR_SIZE, SLICE_TIME);
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}
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static const BlockJobDriver stream_job_driver = {
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.instance_size = sizeof(StreamBlockJob),
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.job_type = BLOCK_JOB_TYPE_STREAM,
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.set_speed = stream_set_speed,
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};
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void stream_start(const char *job_id, BlockDriverState *bs,
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BlockDriverState *base, const char *backing_file_str,
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int64_t speed, BlockdevOnError on_error,
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BlockCompletionFunc *cb, void *opaque, Error **errp)
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{
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StreamBlockJob *s;
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s = block_job_create(job_id, &stream_job_driver, bs, speed,
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cb, opaque, errp);
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if (!s) {
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return;
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}
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s->base = base;
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s->backing_file_str = g_strdup(backing_file_str);
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s->on_error = on_error;
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s->common.co = qemu_coroutine_create(stream_run, s);
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trace_stream_start(bs, base, s, s->common.co, opaque);
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qemu_coroutine_enter(s->common.co);
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}
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