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vulkan: use a single command buffer per command buffer pool

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We violated the spec, which, despite the actual command buffer pool
*not* being involved in any functions which require external synchronization
of the pool, *require* external synchronization even if only the
command buffers are used.

This also has the effect of *significantly* speeding up execution
in case command buffers are contended.
This commit is contained in:
Lynne 2025-04-16 13:03:28 +00:00
parent 36c6c66deb
commit bb3ce284d7
3 changed files with 47 additions and 34 deletions
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1
libavutil/hwcontext_vulkan.c
View File

@ -673,7 +673,6 @@ static VkBool32 VKAPI_CALL vk_dbg_callback(VkDebugUtilsMessageSeverityFlagBitsEX
case 0xfd92477a: /* BestPractices-vkAllocateMemory-small-allocation */
case 0x618ab1e7: /* VUID-VkImageViewCreateInfo-usage-02275 */
case 0x30f4ac70: /* VUID-VkImageCreateInfo-pNext-06811 */
case 0xa05b236e: /* UNASSIGNED-Threading-MultipleThreads-Write */
return VK_FALSE;
default:
break;

78
libavutil/vulkan.c
View File

@ -280,15 +280,19 @@ void ff_vk_exec_pool_free(FFVulkanContext *s, FFVkExecPool *pool)
av_freep(&sd->desc_sets);
}
if (pool->cmd_bufs)
vk->FreeCommandBuffers(s->hwctx->act_dev, pool->cmd_buf_pool,
pool->pool_size, pool->cmd_bufs);
if (pool->cmd_buf_pool)
vk->DestroyCommandPool(s->hwctx->act_dev, pool->cmd_buf_pool, s->hwctx->alloc);
for (int i = 0; i < pool->pool_size; i++) {
if (pool->cmd_buf_pools[i])
vk->FreeCommandBuffers(s->hwctx->act_dev, pool->cmd_buf_pools[i],
1, &pool->cmd_bufs[i]);
if (pool->cmd_buf_pools[i])
vk->DestroyCommandPool(s->hwctx->act_dev, pool->cmd_buf_pools[i], s->hwctx->alloc);
}
if (pool->query_pool)
vk->DestroyQueryPool(s->hwctx->act_dev, pool->query_pool, s->hwctx->alloc);
av_free(pool->query_data);
av_free(pool->cmd_buf_pools);
av_free(pool->cmd_bufs);
av_free(pool->contexts);
}
@ -316,19 +320,10 @@ int ff_vk_exec_pool_init(FFVulkanContext *s, AVVulkanDeviceQueueFamily *qf,
return AVERROR(EINVAL);
}
/* Create command pool */
cqueue_create = (VkCommandPoolCreateInfo) {
.sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO,
.flags = VK_COMMAND_POOL_CREATE_TRANSIENT_BIT |
VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT,
.queueFamilyIndex = qf->idx,
};
ret = vk->CreateCommandPool(s->hwctx->act_dev, &cqueue_create,
s->hwctx->alloc, &pool->cmd_buf_pool);
if (ret != VK_SUCCESS) {
av_log(s, AV_LOG_ERROR, "Command pool creation failure: %s\n",
ff_vk_ret2str(ret));
err = AVERROR_EXTERNAL;
/* Allocate space for command buffer pools */
pool->cmd_buf_pools = av_malloc(nb_contexts*sizeof(*pool->cmd_buf_pools));
if (!pool->cmd_buf_pools) {
err = AVERROR(ENOMEM);
goto fail;
}
@ -339,20 +334,39 @@ int ff_vk_exec_pool_init(FFVulkanContext *s, AVVulkanDeviceQueueFamily *qf,
goto fail;
}
/* Allocate command buffer */
cbuf_create = (VkCommandBufferAllocateInfo) {
.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO,
.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY,
.commandPool = pool->cmd_buf_pool,
.commandBufferCount = nb_contexts,
};
ret = vk->AllocateCommandBuffers(s->hwctx->act_dev, &cbuf_create,
pool->cmd_bufs);
if (ret != VK_SUCCESS) {
av_log(s, AV_LOG_ERROR, "Command buffer alloc failure: %s\n",
ff_vk_ret2str(ret));
err = AVERROR_EXTERNAL;
goto fail;
for (int i = 0; i < nb_contexts; i++) {
/* Create command pool */
cqueue_create = (VkCommandPoolCreateInfo) {
.sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO,
.flags = VK_COMMAND_POOL_CREATE_TRANSIENT_BIT |
VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT,
.queueFamilyIndex = qf->idx,
};
ret = vk->CreateCommandPool(s->hwctx->act_dev, &cqueue_create,
s->hwctx->alloc, &pool->cmd_buf_pools[i]);
if (ret != VK_SUCCESS) {
av_log(s, AV_LOG_ERROR, "Command pool creation failure: %s\n",
ff_vk_ret2str(ret));
err = AVERROR_EXTERNAL;
goto fail;
}
/* Allocate command buffer */
cbuf_create = (VkCommandBufferAllocateInfo) {
.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO,
.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY,
.commandPool = pool->cmd_buf_pools[i],
.commandBufferCount = 1,
};
ret = vk->AllocateCommandBuffers(s->hwctx->act_dev, &cbuf_create,
&pool->cmd_bufs[i]);
if (ret != VK_SUCCESS) {
av_log(s, AV_LOG_ERROR, "Command buffer alloc failure: %s\n",
ff_vk_ret2str(ret));
err = AVERROR_EXTERNAL;
goto fail;
}
}
/* Query pool */

2
libavutil/vulkan.h
View File

@ -253,7 +253,7 @@ typedef struct FFVkExecPool {
FFVkExecContext *contexts;
atomic_uint_least64_t idx;
VkCommandPool cmd_buf_pool;
VkCommandPool *cmd_buf_pools;
VkCommandBuffer *cmd_bufs;
int pool_size;