166 lines
5.7 KiB
Diff
166 lines
5.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Wolfgang Bumiller <w.bumiller@proxmox.com>
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Date: Thu, 15 Feb 2018 11:07:56 +0100
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Subject: [PATCH] vma: add throttling options to drive mapping fifo protocol
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Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
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---
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vma.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--------
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1 file changed, 73 insertions(+), 9 deletions(-)
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diff --git a/vma.c b/vma.c
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index 04915427c8..91ae14cdc3 100644
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--- a/vma.c
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+++ b/vma.c
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@@ -18,7 +18,9 @@
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#include "qemu-common.h"
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#include "qemu/error-report.h"
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#include "qemu/main-loop.h"
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+#include "qemu/cutils.h"
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#include "qapi/qmp/qstring.h"
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+#include "qapi/qmp/qint.h"
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#include "sysemu/char.h" /* qstring_from_str */
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#include "sysemu/block-backend.h"
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@@ -133,9 +135,39 @@ typedef struct RestoreMap {
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char *devname;
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char *path;
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char *format;
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+ uint64_t throttling_bps;
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+ char *throttling_group;
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bool write_zero;
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} RestoreMap;
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+static bool try_parse_option(char **line, const char *optname, char **out, const char *inbuf) {
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+ size_t optlen = strlen(optname);
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+ if (strncmp(*line, optname, optlen) != 0 || (*line)[optlen] != '=') {
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+ return false;
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+ }
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+ if (*out) {
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+ g_error("read map failed - duplicate value for option '%s'", optname);
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+ }
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+ char *value = (*line) + optlen + 1; /* including a '=' */
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+ char *colon = strchr(value, ':');
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+ if (!colon) {
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+ g_error("read map failed - option '%s' not terminated ('%s')",
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+ optname, inbuf);
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+ }
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+ *line = colon+1;
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+ *out = g_strndup(value, colon - value);
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+ return true;
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+}
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+
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+static uint64_t verify_u64(const char *text) {
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+ uint64_t value;
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+ const char *endptr = NULL;
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+ if (qemu_strtou64(text, &endptr, 0, &value) != 0 || !endptr || *endptr) {
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+ g_error("read map failed - not a number: %s", text);
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+ }
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+ return value;
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+}
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+
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static int extract_content(int argc, char **argv)
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{
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int c, ret = 0;
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@@ -209,6 +241,9 @@ static int extract_content(int argc, char **argv)
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while (1) {
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char inbuf[8192];
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char *line = fgets(inbuf, sizeof(inbuf), map);
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+ char *format = NULL;
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+ char *bps = NULL;
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+ char *group = NULL;
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if (!line || line[0] == '\0' || !strcmp(line, "done\n")) {
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break;
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}
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@@ -220,15 +255,19 @@ static int extract_content(int argc, char **argv)
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}
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}
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- char *format = NULL;
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- if (strncmp(line, "format=", sizeof("format=")-1) == 0) {
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- format = line + sizeof("format=")-1;
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- char *colon = strchr(format, ':');
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- if (!colon) {
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- g_error("read map failed - found only a format ('%s')", inbuf);
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+ while (1) {
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+ if (!try_parse_option(&line, "format", &format, inbuf) &&
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+ !try_parse_option(&line, "throttling.bps", &bps, inbuf) &&
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+ !try_parse_option(&line, "throttling.group", &group, inbuf))
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+ {
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+ break;
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}
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- format = g_strndup(format, colon - format);
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- line = colon+1;
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+ }
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+
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+ uint64_t bps_value = 0;
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+ if (bps) {
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+ bps_value = verify_u64(bps);
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+ g_free(bps);
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}
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const char *path;
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@@ -254,6 +293,8 @@ static int extract_content(int argc, char **argv)
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map->devname = g_strdup(devname);
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map->path = g_strdup(path);
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map->format = format;
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+ map->throttling_bps = bps_value;
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+ map->throttling_group = group;
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map->write_zero = write_zero;
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g_hash_table_insert(devmap, map->devname, map);
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@@ -281,6 +322,8 @@ static int extract_content(int argc, char **argv)
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} else if (di) {
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char *devfn = NULL;
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const char *format = NULL;
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+ uint64_t throttling_bps = 0;
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+ const char *throttling_group = NULL;
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int flags = BDRV_O_RDWR | BDRV_O_NO_FLUSH;
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bool write_zero = true;
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@@ -292,6 +335,8 @@ static int extract_content(int argc, char **argv)
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}
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devfn = map->path;
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format = map->format;
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+ throttling_bps = map->throttling_bps;
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+ throttling_group = map->throttling_group;
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write_zero = map->write_zero;
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} else {
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devfn = g_strdup_printf("%s/tmp-disk-%s.raw",
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@@ -328,12 +373,31 @@ static int extract_content(int argc, char **argv)
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qdict_put(options, "driver", qstring_from_str("raw"));
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}
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-
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if (errp || !(blk = blk_new_open(devfn, NULL, options, flags, &errp))) {
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g_error("can't open file %s - %s", devfn,
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error_get_pretty(errp));
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}
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+ if (throttling_group) {
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+ blk_io_limits_enable(blk, throttling_group);
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+ }
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+
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+ if (throttling_bps) {
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+ if (!throttling_group) {
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+ blk_io_limits_enable(blk, devfn);
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+ }
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+
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+ ThrottleConfig cfg;
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+ throttle_config_init(&cfg);
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+ cfg.buckets[THROTTLE_BPS_WRITE].avg = throttling_bps;
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+ Error *err = NULL;
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+ if (!throttle_is_valid(&cfg, &err)) {
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+ error_report_err(err);
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+ g_error("failed to apply throttling");
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+ }
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+ blk_set_io_limits(blk, &cfg);
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+ }
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+
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if (vma_reader_register_bs(vmar, i, blk, write_zero, &errp) < 0) {
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g_error("%s", error_get_pretty(errp));
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}
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--
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2.11.0
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