84 lines
2.8 KiB
Diff
84 lines
2.8 KiB
Diff
From 78bbe28d5f5691330239041448cccfb339eed779 Mon Sep 17 00:00:00 2001
|
|
From: Leonardo Bras <leobras@redhat.com>
|
|
Date: Mon, 11 Jul 2022 18:11:13 -0300
|
|
Subject: [PATCH 03/11] migration/multifd: Report to user when zerocopy not
|
|
working
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
RH-Author: Leonardo Brás <leobras@redhat.com>
|
|
RH-MergeRequest: 111: zero-copy-send fixes & improvements
|
|
RH-Commit: [3/6] 4f9165325b3cb8ff16d8b3b7649ff780fae0e2ad (LeoBras/centos-qemu-kvm)
|
|
RH-Bugzilla: 2107466
|
|
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
|
|
RH-Acked-by: Thomas Huth <thuth@redhat.com>
|
|
RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
|
|
|
Some errors, like the lack of Scatter-Gather support by the network
|
|
interface(NETIF_F_SG) may cause sendmsg(...,MSG_ZEROCOPY) to fail on using
|
|
zero-copy, which causes it to fall back to the default copying mechanism.
|
|
|
|
After each full dirty-bitmap scan there should be a zero-copy flush
|
|
happening, which checks for errors each of the previous calls to
|
|
sendmsg(...,MSG_ZEROCOPY). If all of them failed to use zero-copy, then
|
|
increment dirty_sync_missed_zero_copy migration stat to let the user know
|
|
about it.
|
|
|
|
Signed-off-by: Leonardo Bras <leobras@redhat.com>
|
|
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
|
|
Acked-by: Peter Xu <peterx@redhat.com>
|
|
Message-Id: <20220711211112.18951-4-leobras@redhat.com>
|
|
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
|
(cherry picked from commit d59c40cc483729f2e67c80e58df769ad19976fe9)
|
|
Signed-off-by: Leonardo Bras <leobras@redhat.com>
|
|
---
|
|
migration/multifd.c | 2 ++
|
|
migration/ram.c | 5 +++++
|
|
migration/ram.h | 2 ++
|
|
3 files changed, 9 insertions(+)
|
|
|
|
diff --git a/migration/multifd.c b/migration/multifd.c
|
|
index 0b5b41c53f..96e5f0a058 100644
|
|
--- a/migration/multifd.c
|
|
+++ b/migration/multifd.c
|
|
@@ -626,6 +626,8 @@ int multifd_send_sync_main(QEMUFile *f)
|
|
if (ret < 0) {
|
|
error_report_err(err);
|
|
return -1;
|
|
+ } else if (ret == 1) {
|
|
+ dirty_sync_missed_zero_copy();
|
|
}
|
|
}
|
|
}
|
|
diff --git a/migration/ram.c b/migration/ram.c
|
|
index ee40e4a718..c437ff1b1f 100644
|
|
--- a/migration/ram.c
|
|
+++ b/migration/ram.c
|
|
@@ -406,6 +406,11 @@ static void ram_transferred_add(uint64_t bytes)
|
|
ram_counters.transferred += bytes;
|
|
}
|
|
|
|
+void dirty_sync_missed_zero_copy(void)
|
|
+{
|
|
+ ram_counters.dirty_sync_missed_zero_copy++;
|
|
+}
|
|
+
|
|
/* used by the search for pages to send */
|
|
struct PageSearchStatus {
|
|
/* Current block being searched */
|
|
diff --git a/migration/ram.h b/migration/ram.h
|
|
index 2c6dc3675d..34adf5cb92 100644
|
|
--- a/migration/ram.h
|
|
+++ b/migration/ram.h
|
|
@@ -86,4 +86,6 @@ void ram_write_tracking_prepare(void);
|
|
int ram_write_tracking_start(void);
|
|
void ram_write_tracking_stop(void);
|
|
|
|
+void dirty_sync_missed_zero_copy(void);
|
|
+
|
|
#endif
|
|
--
|
|
2.31.1
|
|
|