From: David Hildenbrand <david@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>, qemu-devel@nongnu.org
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>,
Alex Williamson <alex.williamson@redhat.com>,
Wei Yang <richard.weiyang@linux.alibaba.com>,
"Michael S . Tsirkin" <mst@redhat.com>,
"Dr . David Alan Gilbert" <dgilbert@redhat.com>,
Peter Xu <peterx@redhat.com>, Auger Eric <eric.auger@redhat.com>,
Pankaj Gupta <pankaj.gupta@cloud.ionos.com>,
teawater <teawaterz@linux.alibaba.com>,
Igor Mammedov <imammedo@redhat.com>,
Marek Kedzierski <mkedzier@redhat.com>
Subject: Re: [PATCH v6 09/12] softmmu/physmem: Don't use atomic operations in ram_block_discard_(disable|require)
Date: Mon, 22 Feb 2021 14:33:10 +0100 [thread overview]
Message-ID: <d64fdd53-6868-15fd-ea81-fa26e153eced@redhat.com> (raw)
In-Reply-To: <b5be291b-5864-4852-50bd-e75352ba8876@redhat.com>
On 22.02.21 14:14, Paolo Bonzini wrote:
> On 22/02/21 12:57, David Hildenbrand wrote:
>>
>>
>> -/*
>> - * If positive, discarding RAM is disabled. If negative, discarding RAM is
>> - * required to work and cannot be disabled.
>> - */
>> -static int ram_block_discard_disabled;
>> +static unsigned int ram_block_discard_requirers;
>> +static unsigned int ram_block_discard_disablers;
>
> Requirer is not an English word, so perhaps use required_cnt and
> disabled_cnt?
I did a internet search back then and was not completely sure if it's
okay. See
https://en.wiktionary.org/wiki/requirer
for example (not 100% trustworthy of course).
No strong opinion on the name (required_cnt/disabled_cnt is clearer).
>
> Also, uncoordinated require is unused, and therefore uncoordinated
> disable is also never going to block anything. Does it make sense to
> keep it in the API?
Right, "ram_block_discard_require()" is not used yet. I am planning on
using it in virtio-balloon context at some point, but can remove it for
now to simplify.
ram_block_uncoordinated_discard_disable(), however, will block
virtio-balloon already via ram_block_discard_is_disabled(). (yes,
virtio-balloon is ugly)
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2021-02-22 13:37 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-22 11:56 [PATCH v6 00/12] virtio-mem: vfio support David Hildenbrand
2021-02-22 11:56 ` [PATCH v6 01/12] memory: Introduce RamDiscardMgr for RAM memory regions David Hildenbrand
2021-02-22 13:27 ` Paolo Bonzini
2021-02-22 14:03 ` David Hildenbrand
2021-02-22 14:18 ` Paolo Bonzini
2021-02-22 14:53 ` David Hildenbrand
2021-02-22 17:37 ` Paolo Bonzini
2021-02-22 17:48 ` David Hildenbrand
2021-02-22 19:43 ` David Hildenbrand
2021-02-23 10:50 ` David Hildenbrand
2021-02-23 15:03 ` Paolo Bonzini
2021-02-23 15:09 ` David Hildenbrand
2021-02-22 11:56 ` [PATCH v6 02/12] virtio-mem: Factor out traversing unplugged ranges David Hildenbrand
2021-02-22 11:56 ` [PATCH v6 03/12] virtio-mem: Don't report errors when ram_block_discard_range() fails David Hildenbrand
2021-02-22 11:57 ` [PATCH v6 04/12] virtio-mem: Implement RamDiscardMgr interface David Hildenbrand
2021-02-22 11:57 ` [PATCH v6 05/12] vfio: Support for RamDiscardMgr in the !vIOMMU case David Hildenbrand
2021-02-22 13:20 ` Paolo Bonzini
2021-02-22 14:43 ` David Hildenbrand
2021-02-22 17:29 ` Paolo Bonzini
2021-02-22 17:34 ` David Hildenbrand
2021-02-22 11:57 ` [PATCH v6 06/12] vfio: Query and store the maximum number of possible DMA mappings David Hildenbrand
2021-02-22 11:57 ` [PATCH v6 07/12] vfio: Sanity check maximum number of DMA mappings with RamDiscardMgr David Hildenbrand
2021-02-22 11:57 ` [PATCH v6 08/12] vfio: Support for RamDiscardMgr in the vIOMMU case David Hildenbrand
2021-02-22 11:57 ` [PATCH v6 09/12] softmmu/physmem: Don't use atomic operations in ram_block_discard_(disable|require) David Hildenbrand
2021-02-22 13:14 ` Paolo Bonzini
2021-02-22 13:33 ` David Hildenbrand [this message]
2021-02-22 14:02 ` Paolo Bonzini
2021-02-22 15:38 ` David Hildenbrand
2021-02-22 17:32 ` Paolo Bonzini
2021-02-23 9:02 ` David Hildenbrand
2021-02-23 15:02 ` Paolo Bonzini
2021-02-22 11:57 ` [PATCH v6 10/12] softmmu/physmem: Extend ram_block_discard_(require|disable) by two discard types David Hildenbrand
2021-02-22 11:57 ` [PATCH v6 11/12] virtio-mem: Require only coordinated discards David Hildenbrand
2021-02-22 11:57 ` [PATCH v6 12/12] vfio: Disable only uncoordinated discards for VFIO_TYPE1 iommus David Hildenbrand
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