xen/libxc-sr-save-show_transfer_rate.patch

117 lines
3.4 KiB
Diff

From: Olaf Hering <olaf@aepfle.de>
Date: Fri, 23 Oct 2020 15:39:59 +0200
Subject: libxc sr save show_transfer_rate
tools: show migration transfer rate in send_dirty_pages
Show how fast domU pages are transferred in each iteration.
The relevant data is how fast the pfns travel, not so much how much
protocol overhead exists. So the reported MiB/sec is just for pfns.
Signed-off-by: Olaf Hering <olaf@aepfle.de>
v02:
- rearrange MiB_sec calculation (jgross)
---
tools/libs/guest/xg_sr_common.h | 2 ++
tools/libs/guest/xg_sr_save.c | 46 +++++++++++++++++++++++++++++++++
2 files changed, 48 insertions(+)
--- a/tools/libs/guest/xg_sr_common.h
+++ b/tools/libs/guest/xg_sr_common.h
@@ -238,6 +238,8 @@ struct xc_sr_context
bool debug;
unsigned long p2m_size;
+ size_t pages_sent;
+ size_t overhead_sent;
struct precopy_stats stats;
--- a/tools/libs/guest/xg_sr_save.c
+++ b/tools/libs/guest/xg_sr_save.c
@@ -1,5 +1,6 @@
#include <assert.h>
#include <arpa/inet.h>
+#include <time.h>
#include "xg_sr_common.h"
@@ -238,6 +239,8 @@ static int write_batch(struct xc_sr_cont
iov[3].iov_len = nr_pfns * sizeof(*rec_pfns);
iovcnt = 4;
+ ctx->save.pages_sent += nr_pages;
+ ctx->save.overhead_sent += sizeof(rec) + sizeof(hdr) + nr_pfns * sizeof(*rec_pfns);
if ( nr_pages )
{
@@ -356,6 +359,42 @@ static int suspend_domain(struct xc_sr_c
return 0;
}
+static void show_transfer_rate(struct xc_sr_context *ctx, struct timespec *start)
+{
+ xc_interface *xch = ctx->xch;
+ struct timespec end = {}, diff = {};
+ size_t ms, MiB_sec;
+
+ if (!ctx->save.pages_sent)
+ return;
+
+ if ( clock_gettime(CLOCK_MONOTONIC, &end) )
+ PERROR("clock_gettime");
+
+ if ( (end.tv_nsec - start->tv_nsec) < 0 )
+ {
+ diff.tv_sec = end.tv_sec - start->tv_sec - 1;
+ diff.tv_nsec = end.tv_nsec - start->tv_nsec + (1000U*1000U*1000U);
+ }
+ else
+ {
+ diff.tv_sec = end.tv_sec - start->tv_sec;
+ diff.tv_nsec = end.tv_nsec - start->tv_nsec;
+ }
+
+ ms = (diff.tv_nsec / (1000U*1000U));
+ ms += (diff.tv_sec * 1000U);
+ if (!ms)
+ ms = 1;
+
+ MiB_sec = (ctx->save.pages_sent * PAGE_SIZE * 1000U) / ms / (1024U*1024U);
+
+ errno = 0;
+ IPRINTF("%s: %zu bytes + %zu pages in %ld.%09ld sec, %zu MiB/sec", __func__,
+ ctx->save.overhead_sent, ctx->save.pages_sent,
+ diff.tv_sec, diff.tv_nsec, MiB_sec);
+}
+
/*
* Send a subset of pages in the guests p2m, according to the dirty bitmap.
* Used for each subsequent iteration of the live migration loop.
@@ -369,9 +408,15 @@ static int send_dirty_pages(struct xc_sr
xen_pfn_t p;
unsigned long written;
int rc;
+ struct timespec start = {};
DECLARE_HYPERCALL_BUFFER_SHADOW(unsigned long, dirty_bitmap,
&ctx->save.dirty_bitmap_hbuf);
+ ctx->save.pages_sent = 0;
+ ctx->save.overhead_sent = 0;
+ if ( clock_gettime(CLOCK_MONOTONIC, &start) )
+ PERROR("clock_gettime");
+
for ( p = 0, written = 0; p < ctx->save.p2m_size; ++p )
{
if ( !test_bit(p, dirty_bitmap) )
@@ -395,6 +440,7 @@ static int send_dirty_pages(struct xc_sr
if ( written > entries )
DPRINTF("Bitmap contained more entries than expected...");
+ show_transfer_rate(ctx, &start);
xc_report_progress_step(xch, entries, entries);
return ctx->save.ops.check_vm_state(ctx);