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Re: [PATCH v2 4/6] util: introduce SharedResource
From: |
Max Reitz |
Subject: |
Re: [PATCH v2 4/6] util: introduce SharedResource |
Date: |
Tue, 22 Oct 2019 12:23:27 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 |
On 16.10.19 19:09, Vladimir Sementsov-Ogievskiy wrote:
> Introduce an API for some shared splittable resource, like memory.
> It's going to be used by backup. Backup uses both read/write io and
> copy_range. copy_range may consume memory implictly, so the new API is
> abstract: it doesn't allocate any real memory by but only hands out
-by
> tickets.
>
> The idea is that we have some total amount of something and callers
> should wait in coroutine queue if there is not enough of the resource
> at the moment.
>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
> ---
> include/qemu/co-shared-resource.h | 71 +++++++++++++++++++++++++++++
> util/qemu-co-shared-resource.c | 76 +++++++++++++++++++++++++++++++
> util/Makefile.objs | 1 +
> 3 files changed, 148 insertions(+)
> create mode 100644 include/qemu/co-shared-resource.h
> create mode 100644 util/qemu-co-shared-resource.c
>
> diff --git a/include/qemu/co-shared-resource.h
> b/include/qemu/co-shared-resource.h
> new file mode 100644
> index 0000000000..04c9c3d5be
> --- /dev/null
> +++ b/include/qemu/co-shared-resource.h
> @@ -0,0 +1,71 @@
> +/*
> + * Helper functionality for distributing a fixed total amount of
> + * an abstract resource among multiple coroutines.
> + *
> + * Copyright (c) 2019 Virtuozzo International GmbH
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> copy
> + * of this software and associated documentation files (the "Software"), to
> deal
> + * in the Software without restriction, including without limitation the
> rights
> + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
> + * copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> FROM,
> + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
> + * THE SOFTWARE.
> + */
> +
> +#ifndef QEMU_CO_SHARED_AMOUNT_H
> +#define QEMU_CO_SHARED_AMOUNT_H
You should probably adjust these include guards to match the new filename.
With those bits fixed:
Reviewed-by: Max Reitz <address@hidden>
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- [PATCH v2 0/6] block-copy: memory limit, Vladimir Sementsov-Ogievskiy, 2019/10/16
- [PATCH v2 6/6] block/block-copy: increase buffered copy request, Vladimir Sementsov-Ogievskiy, 2019/10/16
- [PATCH v2 4/6] util: introduce SharedResource, Vladimir Sementsov-Ogievskiy, 2019/10/16
- Re: [PATCH v2 4/6] util: introduce SharedResource,
Max Reitz <=
- [PATCH v2 1/6] block/block-copy: allocate buffer in block_copy_with_bounce_buffer, Vladimir Sementsov-Ogievskiy, 2019/10/16
- [PATCH v2 5/6] block/block-copy: add memory limit, Vladimir Sementsov-Ogievskiy, 2019/10/16
- [PATCH v2 2/6] block/block-copy: limit copy_range_size to 16 MiB, Vladimir Sementsov-Ogievskiy, 2019/10/16
- [PATCH v2 3/6] block/block-copy: refactor copying, Vladimir Sementsov-Ogievskiy, 2019/10/16