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migration/multifd: Drop stale comment for multifd zero copy

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We've already done that with multifd_flush_after_each_section, for multifd
in general.  Drop the stale "TODO-like" comment.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20240202102857.110210-2-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Peter Xu 2024-02-02 18:28:35 +08:00
parent 06152b89db
commit 8888a552bf
1 changed files with 0 additions and 11 deletions
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migration/multifd.c
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@ -598,17 +598,6 @@ int multifd_send_sync_main(void)
} }
} }
/*
* When using zero-copy, it's necessary to flush the pages before any of
* the pages can be sent again, so we'll make sure the new version of the
* pages will always arrive _later_ than the old pages.
*
* Currently we achieve this by flushing the zero-page requested writes
* per ram iteration, but in the future we could potentially optimize it
* to be less frequent, e.g. only after we finished one whole scanning of
* all the dirty bitmaps.
*/
flush_zero_copy = migrate_zero_copy_send(); flush_zero_copy = migrate_zero_copy_send();
for (i = 0; i < migrate_multifd_channels(); i++) { for (i = 0; i < migrate_multifd_channels(); i++) {