From: Wei Yang <richardw.yang@linux.intel.com>
To: quintela@redhat.com, dgilbert@redhat.com
Cc: qemu-devel@nongnu.org, Wei Yang <richardw.yang@linux.intel.com>
Subject: [PATCH v2 0/6] migration/multifd: a new mechanism for send thread sync
Date: Sat, 26 Oct 2019 08:45:14 +0800 [thread overview]
Message-ID: <20191026004520.5515-1-richardw.yang@linux.intel.com> (raw)
Current send thread could work while the sync mechanism has some problem:
* has spuriously wakeup
* number of channels_ready will *overflow* the number of real channels
The reason is:
* if MULTIFD_FLAG_SYNC is set in the middle of send thread running, there
is one more spurious wakeup
* if MULTIFD_FLAG_SYNC is set when send thread is not running, there is one
more channels_ready be triggered
To solve this situation, one new mechanism is introduced to synchronize send
threads. The idea is simple, a new field *sync* is introduced to indicate a
synchronization is required.
---
v2: rebase on latest code
Wei Yang (6):
migration/multifd: move Params update and pages cleanup into
multifd_send_fill_packet()
migration/multifd: notify channels_ready when send thread starts
migration/multifd: use sync field to synchronize send threads
migration/multifd: used must not be 0 for a pending job
migration/multifd: use boolean for pending_job is enough
migration/multifd: there is no spurious wakeup now
migration/ram.c | 74 +++++++++++++++++++++++++++++++------------------
1 file changed, 47 insertions(+), 27 deletions(-)
--
2.17.1
next reply other threads:[~2019-10-26 1:24 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-26 0:45 Wei Yang [this message]
2019-10-26 0:45 ` [PATCH v2 1/6] migration/multifd: move Params update and pages cleanup into multifd_send_fill_packet() Wei Yang
2019-11-19 10:57 ` Juan Quintela
2019-11-29 8:30 ` Wei Yang
2019-10-26 0:45 ` [PATCH v2 2/6] migration/multifd: notify channels_ready when send thread starts Wei Yang
2019-10-26 0:45 ` [PATCH v2 3/6] migration/multifd: use sync field to synchronize send threads Wei Yang
2019-10-26 0:45 ` [PATCH v2 4/6] migration/multifd: used must not be 0 for a pending job Wei Yang
2019-10-26 0:45 ` [PATCH v2 5/6] migration/multifd: use boolean for pending_job is enough Wei Yang
2019-10-26 0:45 ` [PATCH v2 6/6] migration/multifd: there is no spurious wakeup now Wei Yang
2019-12-16 2:36 ` [PATCH v2 0/6] migration/multifd: a new mechanism for send thread sync Wei Yang
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