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Re: [Qemu-devel] [PATCH v2 07/10] migration: Don't play games with the r
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH v2 07/10] migration: Don't play games with the requested cache size |
Date: |
Mon, 23 Oct 2017 15:27:59 +0100 |
User-agent: |
Mutt/1.9.1 (2017-09-22) |
* Juan Quintela (address@hidden) wrote:
> Now that we check that the value passed is a power of 2, we don't need
> to play games when comparing what is the size that is going to take
> the cache.
>
> Signed-off-by: Juan Quintela <address@hidden>
> ---
> migration/ram.c | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/migration/ram.c b/migration/ram.c
> index 47501460c8..c84f22d759 100644
> --- a/migration/ram.c
> +++ b/migration/ram.c
> @@ -135,12 +135,14 @@ int64_t xbzrle_cache_resize(int64_t new_size, Error
> **errp)
> return -1;
> }
>
> + if (new_size == migrate_xbzrle_cache_size()) {
> + /* nothing to do */
> + return new_size;
> + }
> +
OK, that's interesting - this test is before the XBZRLE != NULL check;
so the old code would cause allocation if there was no cache; but I
think ram_state_init makes that irrelevant, so we're OK.
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
> XBZRLE_cache_lock();
>
> if (XBZRLE.cache != NULL) {
> - if (pow2floor(new_size) == migrate_xbzrle_cache_size()) {
> - goto out_new_size;
> - }
> new_cache = cache_init(new_size, TARGET_PAGE_SIZE, errp);
> if (!new_cache) {
> ret = -1;
> @@ -151,8 +153,7 @@ int64_t xbzrle_cache_resize(int64_t new_size, Error
> **errp)
> XBZRLE.cache = new_cache;
> }
>
> -out_new_size:
> - ret = pow2floor(new_size);
> + ret = new_size;
> out:
> XBZRLE_cache_unlock();
> return ret;
> --
> 2.13.6
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- [Qemu-devel] [PATCH v2 00/10] Make xbzrle_cache_size a migration parameter, Juan Quintela, 2017/10/18
- [Qemu-devel] [PATCH v2 01/10] migration: Fix migrate_test_apply for multifd parameters, Juan Quintela, 2017/10/18
- [Qemu-devel] [PATCH v2 03/10] migration: Make cache size elements use the right types, Juan Quintela, 2017/10/18
- [Qemu-devel] [PATCH v2 02/10] migratiom: Remove max_item_age parameter, Juan Quintela, 2017/10/18
- [Qemu-devel] [PATCH v2 04/10] migration: Move xbzrle cache resize error handling to xbzrle_cache_resize, Juan Quintela, 2017/10/18
- [Qemu-devel] [PATCH v2 06/10] migration: Make sure that we pass the right cache size, Juan Quintela, 2017/10/18
- [Qemu-devel] [PATCH v2 05/10] migration: Make cache_init() take an error parameter, Juan Quintela, 2017/10/18
- [Qemu-devel] [PATCH v2 07/10] migration: Don't play games with the requested cache size, Juan Quintela, 2017/10/18
- Re: [Qemu-devel] [PATCH v2 07/10] migration: Don't play games with the requested cache size,
Dr. David Alan Gilbert <=
- [Qemu-devel] [PATCH v2 08/10] migration: No need to return the size of the cache, Juan Quintela, 2017/10/18
- [Qemu-devel] [PATCH v2 09/10] migration: Make xbzrle_cache_size a migration parameter, Juan Quintela, 2017/10/18
- [Qemu-devel] [PATCH v2 10/10] migration: [RFC] Use proper types in json, Juan Quintela, 2017/10/18