diff options
| author | Leonardo Bras <leobras@redhat.com> | 2022-07-11 18:11:13 -0300 |
|---|---|---|
| committer | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2022-07-20 12:15:09 +0100 |
| commit | d59c40cc483729f2e67c80e58df769ad19976fe9 (patch) | |
| tree | 252bf54ccd0ff3a7f405dd8691a98dcbad79e595 /migration/ram.c | |
| parent | cf20c897338067ab4b70a4596fdccaf90c7e29a1 (diff) | |
migration/multifd: Report to user when zerocopy not working
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>
Diffstat (limited to 'migration/ram.c')
| -rw-r--r-- | migration/ram.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/migration/ram.c b/migration/ram.c index 4fbad74c6c..b94669ba5d 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -434,6 +434,11 @@ 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 */ |