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authorDr. David Alan Gilbert <dgilbert@redhat.com>2018-06-13 11:26:41 +0100
committerDr. David Alan Gilbert <dgilbert@redhat.com>2018-06-15 14:40:56 +0100
commitad767bed5af559ed32c6dabdcaccc3f75731e1f4 (patch)
treee29268c63f734e0d24788e5f1356d72647ab9d24 /hw/usb/dev-smartcard-reader.c
parent7e555c6c58f095c9286814c3f9cd06196feba8a1 (diff)
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migration: Wake rate limiting for urgent requests
Rate limiting sleeps the migration thread for a while when it runs
out of bandwidth; but sometimes we want to wake up to get on with
something more urgent (like a postcopy request).  Here we use
a semaphore with a timedwait instead of a simple sleep; Incrementing
the sempahore will wake it up sooner.  Anything that consumes
these urgent events must decrement the sempahore.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20180613102642.23995-3-dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Diffstat (limited to 'hw/usb/dev-smartcard-reader.c')
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