From: Ilias Apalodimas <ilias.apalodimas@linaro.org>
To: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Mel Gorman <mgorman@techsingularity.net>,
linux-mm@kvack.org, chuck.lever@oracle.com,
netdev@vger.kernel.org, linux-nfs@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH RFC net-next 2/3] net: page_pool: use alloc_pages_bulk in refill code path
Date: Wed, 24 Feb 2021 22:15:22 +0200 [thread overview]
Message-ID: <YDaz2tXXxEkcBfRR@apalos.home> (raw)
In-Reply-To: <161419300618.2718959.11165518489200268845.stgit@firesoul>
Hi Jesper,
On Wed, Feb 24, 2021 at 07:56:46PM +0100, Jesper Dangaard Brouer wrote:
> There are cases where the page_pool need to refill with pages from the
> page allocator. Some workloads cause the page_pool to release pages
> instead of recycling these pages.
>
> For these workload it can improve performance to bulk alloc pages from
> the page-allocator to refill the alloc cache.
>
> For XDP-redirect workload with 100G mlx5 driver (that use page_pool)
> redirecting xdp_frame packets into a veth, that does XDP_PASS to create
> an SKB from the xdp_frame, which then cannot return the page to the
> page_pool. In this case, we saw[1] an improvement of 18.8% from using
> the alloc_pages_bulk API (3,677,958 pps -> 4,368,926 pps).
>
> [1] https://github.com/xdp-project/xdp-project/blob/master/areas/mem/page_pool06_alloc_pages_bulk.org
>
> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
[...]
> + /* Remaining pages store in alloc.cache */
> + list_for_each_entry_safe(page, next, &page_list, lru) {
> + list_del(&page->lru);
> + if (pp_flags & PP_FLAG_DMA_MAP) {
> + page = page_pool_dma_map(pool, page);
> + if (!page)
As I commented on the previous patch, i'd prefer the put_page() here to be
explicitly called, instead of hiding in the page_pool_dma_map()
> + continue;
> + }
> + if (likely(pool->alloc.count < PP_ALLOC_CACHE_SIZE)) {
> + pool->alloc.cache[pool->alloc.count++] = page;
> + pool->pages_state_hold_cnt++;
> + trace_page_pool_state_hold(pool, page,
> + pool->pages_state_hold_cnt);
> + } else {
> + put_page(page);
> + }
> + }
> +out:
> if (pool->p.flags & PP_FLAG_DMA_MAP) {
> - page = page_pool_dma_map(pool, page);
> - if (!page)
> + first_page = page_pool_dma_map(pool, first_page);
> + if (!first_page)
> return NULL;
> }
>
[...]
Cheers
/Ilias
next prev parent reply other threads:[~2021-02-24 20:15 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-24 10:26 [RFC PATCH 0/3] Introduce a bulk order-0 page allocator for sunrpc Mel Gorman
2021-02-24 10:26 ` [PATCH 1/3] SUNRPC: Set rq_page_end differently Mel Gorman
2021-02-24 10:26 ` [PATCH 2/3] mm, page_alloc: Add a bulk page allocator Mel Gorman
2021-02-24 10:26 ` [PATCH 3/3] SUNRPC: Refresh rq_pages using " Mel Gorman
2021-02-24 11:27 ` [RFC PATCH 0/3] Introduce a bulk order-0 page allocator for sunrpc Jesper Dangaard Brouer
2021-02-24 11:55 ` Mel Gorman
2021-02-24 13:20 ` Chuck Lever
2021-02-24 18:56 ` [PATCH RFC net-next 0/3] Use bulk order-0 page allocator API for page_pool Jesper Dangaard Brouer
2021-02-24 18:56 ` [PATCH RFC net-next 1/3] net: page_pool: refactor dma_map into own function page_pool_dma_map Jesper Dangaard Brouer
2021-02-24 20:11 ` Ilias Apalodimas
2021-02-24 18:56 ` [PATCH RFC net-next 2/3] net: page_pool: use alloc_pages_bulk in refill code path Jesper Dangaard Brouer
2021-02-24 20:15 ` Ilias Apalodimas [this message]
2021-02-26 14:31 ` Jesper Dangaard Brouer
2021-02-24 18:56 ` [PATCH RFC net-next 3/3] mm: make zone->free_area[order] access faster Jesper Dangaard Brouer
2021-02-25 11:28 ` Mel Gorman
2021-02-25 15:16 ` Jesper Dangaard Brouer
2021-02-25 15:38 ` Mel Gorman
2021-02-26 14:34 ` Jesper Dangaard Brouer
2021-03-01 13:29 ` [PATCH RFC V2 net-next 0/2] Use bulk order-0 page allocator API for page_pool Jesper Dangaard Brouer
2021-03-01 13:29 ` [PATCH RFC V2 net-next 1/2] net: page_pool: refactor dma_map into own function page_pool_dma_map Jesper Dangaard Brouer
2021-03-01 13:29 ` [PATCH RFC V2 net-next 2/2] net: page_pool: use alloc_pages_bulk in refill code path Jesper Dangaard Brouer
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