From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
To: Wei Yang <richardw.yang@linux.intel.com>
Cc: qemu-devel@nongnu.org, quintela@redhat.com
Subject: Re: [PATCH 4/6] migration/postcopy: set all_zero to true on the first target page
Date: Wed, 6 Nov 2019 20:04:58 +0000 [thread overview]
Message-ID: <20191106200458.GK2802@work-vm> (raw)
In-Reply-To: <20191018004850.9888-5-richardw.yang@linux.intel.com>
* Wei Yang (richardw.yang@linux.intel.com) wrote:
> For the first target page, all_zero is set to true for this round check.
>
> After target_pages introduced, we could leverage this variable instead
> of checking the address offset.
>
> Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Yes, OK - I find target_pages being incremented before
this point a bit confusing, I think of '0' as the first one.
Still, it's OK:
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> ---
> migration/ram.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/migration/ram.c b/migration/ram.c
> index 5c05376d8d..b5759793a9 100644
> --- a/migration/ram.c
> +++ b/migration/ram.c
> @@ -4067,7 +4067,7 @@ static int ram_load_postcopy(QEMUFile *f)
> page_buffer = postcopy_host_page +
> ((uintptr_t)host & (block->page_size - 1));
> /* If all TP are zero then we can optimise the place */
> - if (!((uintptr_t)host & (block->page_size - 1))) {
> + if (target_pages == 1) {
> all_zero = true;
> } else {
> /* not the 1st TP within the HP */
> --
> 2.17.1
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
next prev parent reply other threads:[~2019-11-06 20:07 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-18 0:48 [PATCH 0/6] migration/postcopy: enable compress during postcopy Wei Yang
2019-10-18 0:48 ` [PATCH 1/6] migration/postcopy: reduce memset when it is zero page and matches_target_page_size Wei Yang
2019-11-06 18:18 ` Dr. David Alan Gilbert
2019-10-18 0:48 ` [PATCH 2/6] migration/postcopy: wait for decompress thread in precopy Wei Yang
2019-11-06 19:57 ` Dr. David Alan Gilbert
2019-10-18 0:48 ` [PATCH 3/6] migration/postcopy: count target page number to decide the place_needed Wei Yang
2019-11-06 19:59 ` Dr. David Alan Gilbert
2019-10-18 0:48 ` [PATCH 4/6] migration/postcopy: set all_zero to true on the first target page Wei Yang
2019-11-06 20:04 ` Dr. David Alan Gilbert [this message]
2019-10-18 0:48 ` [PATCH 5/6] migration/postcopy: enable random order target page arrival Wei Yang
2019-11-06 20:08 ` Dr. David Alan Gilbert
2019-11-07 6:00 ` Wei Yang
2019-11-07 9:14 ` Dr. David Alan Gilbert
2019-10-18 0:48 ` [PATCH 6/6] migration/postcopy: enable compress during postcopy Wei Yang
2019-11-06 19:55 ` Dr. David Alan Gilbert
2019-10-18 16:50 ` [PATCH 0/6] " no-reply
2019-10-19 0:15 ` Wei Yang
2019-11-06 20:11 ` Dr. David Alan Gilbert
2019-11-07 6:02 ` Wei Yang
2019-11-07 9:15 ` Dr. David Alan Gilbert
2019-11-07 12:03 ` Wei Yang
2019-11-07 12:06 ` Dr. David Alan Gilbert
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