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authorluzhipeng <luzhipeng@cestc.cn>2022-05-20 10:19:35 +0800
committerKonstantin Kostiuk <kkostiuk@redhat.com>2022-05-25 12:12:01 +0300
commit3569664ee9f08c94a5a2c69f778f0d023e5e882f (patch)
treefc45d9ba8f7a5af0ab02afef44ee404fe0f0812a /qga/commands-posix.c
parent0cac736e73723850a99e5142e35d14d8f8efb232 (diff)
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qga: add guest-get-diskstats command for Linux guests
Add a new 'guest-get-diskstats' command for report disk io statistics for Linux guests. This can be useful for getting io flow or handling IO fault, no need to enter guests. Signed-off-by: luzhipeng <luzhipeng@cestc.cn> Message-Id: <20220520021935.676-1-luzhipeng@cestc.cn> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Konstantin Kostiuk <kkostiuk@redhat.com> Signed-off-by: Konstantin Kostiuk <kkostiuk@redhat.com>
Diffstat (limited to 'qga/commands-posix.c')
-rw-r--r--qga/commands-posix.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index 69f209a..12b50b7 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -2783,6 +2783,122 @@ GuestMemoryBlockInfo *qmp_guest_get_memory_block_info(Error **errp)
return info;
}
+#define MAX_NAME_LEN 128
+static GuestDiskStatsInfoList *guest_get_diskstats(Error **errp)
+{
+#ifdef CONFIG_LINUX
+ GuestDiskStatsInfoList *head = NULL, **tail = &head;
+ const char *diskstats = "/proc/diskstats";
+ FILE *fp;
+ size_t n;
+ char *line = NULL;
+
+ fp = fopen(diskstats, "r");
+ if (fp == NULL) {
+ error_setg_errno(errp, errno, "open(\"%s\")", diskstats);
+ return NULL;
+ }
+
+ while (getline(&line, &n, fp) != -1) {
+ g_autofree GuestDiskStatsInfo *diskstatinfo = NULL;
+ g_autofree GuestDiskStats *diskstat = NULL;
+ char dev_name[MAX_NAME_LEN];
+ unsigned int ios_pgr, tot_ticks, rq_ticks, wr_ticks, dc_ticks, fl_ticks;
+ unsigned long rd_ios, rd_merges_or_rd_sec, rd_ticks_or_wr_sec, wr_ios;
+ unsigned long wr_merges, rd_sec_or_wr_ios, wr_sec;
+ unsigned long dc_ios, dc_merges, dc_sec, fl_ios;
+ unsigned int major, minor;
+ int i;
+
+ i = sscanf(line, "%u %u %s %lu %lu %lu"
+ "%lu %lu %lu %lu %u %u %u %u"
+ "%lu %lu %lu %u %lu %u",
+ &major, &minor, dev_name,
+ &rd_ios, &rd_merges_or_rd_sec, &rd_sec_or_wr_ios,
+ &rd_ticks_or_wr_sec, &wr_ios, &wr_merges, &wr_sec,
+ &wr_ticks, &ios_pgr, &tot_ticks, &rq_ticks,
+ &dc_ios, &dc_merges, &dc_sec, &dc_ticks,
+ &fl_ios, &fl_ticks);
+
+ if (i < 7) {
+ continue;
+ }
+
+ diskstatinfo = g_new0(GuestDiskStatsInfo, 1);
+ diskstatinfo->name = g_strdup(dev_name);
+ diskstatinfo->major = major;
+ diskstatinfo->minor = minor;
+
+ diskstat = g_new0(GuestDiskStats, 1);
+ if (i == 7) {
+ diskstat->has_read_ios = true;
+ diskstat->read_ios = rd_ios;
+ diskstat->has_read_sectors = true;
+ diskstat->read_sectors = rd_merges_or_rd_sec;
+ diskstat->has_write_ios = true;
+ diskstat->write_ios = rd_sec_or_wr_ios;
+ diskstat->has_write_sectors = true;
+ diskstat->write_sectors = rd_ticks_or_wr_sec;
+ }
+ if (i >= 14) {
+ diskstat->has_read_ios = true;
+ diskstat->read_ios = rd_ios;
+ diskstat->has_read_sectors = true;
+ diskstat->read_sectors = rd_sec_or_wr_ios;
+ diskstat->has_read_merges = true;
+ diskstat->read_merges = rd_merges_or_rd_sec;
+ diskstat->has_read_ticks = true;
+ diskstat->read_ticks = rd_ticks_or_wr_sec;
+ diskstat->has_write_ios = true;
+ diskstat->write_ios = wr_ios;
+ diskstat->has_write_sectors = true;
+ diskstat->write_sectors = wr_sec;
+ diskstat->has_write_merges = true;
+ diskstat->write_merges = wr_merges;
+ diskstat->has_write_ticks = true;
+ diskstat->write_ticks = wr_ticks;
+ diskstat->has_ios_pgr = true;
+ diskstat->ios_pgr = ios_pgr;
+ diskstat->has_total_ticks = true;
+ diskstat->total_ticks = tot_ticks;
+ diskstat->has_weight_ticks = true;
+ diskstat->weight_ticks = rq_ticks;
+ }
+ if (i >= 18) {
+ diskstat->has_discard_ios = true;
+ diskstat->discard_ios = dc_ios;
+ diskstat->has_discard_merges = true;
+ diskstat->discard_merges = dc_merges;
+ diskstat->has_discard_sectors = true;
+ diskstat->discard_sectors = dc_sec;
+ diskstat->has_discard_ticks = true;
+ diskstat->discard_ticks = dc_ticks;
+ }
+ if (i >= 20) {
+ diskstat->has_flush_ios = true;
+ diskstat->flush_ios = fl_ios;
+ diskstat->has_flush_ticks = true;
+ diskstat->flush_ticks = fl_ticks;
+ }
+
+ diskstatinfo->stats = g_steal_pointer(&diskstat);
+ QAPI_LIST_APPEND(tail, diskstatinfo);
+ diskstatinfo = NULL;
+ }
+ free(line);
+ fclose(fp);
+ return head;
+#else
+ g_debug("disk stats reporting available only for Linux");
+ return NULL;
+#endif
+}
+
+GuestDiskStatsInfoList *qmp_guest_get_diskstats(Error **errp)
+{
+ return guest_get_diskstats(errp);
+}
+
#else /* defined(__linux__) */
void qmp_guest_suspend_disk(Error **errp)
@@ -3131,6 +3247,13 @@ GuestDiskInfoList *qmp_guest_get_disks(Error **errp)
return NULL;
}
+GuestDiskStatsInfoList *qmp_guest_get_diskstats(Error **errp)
+{
+ error_setg(errp, QERR_UNSUPPORTED);
+ return NULL;
+}
+
+
#endif /* CONFIG_FSFREEZE */
#if !defined(CONFIG_FSTRIM)