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Message-Id: <20221130220803.3657490-6-willy@infradead.org>
Date: Wed, 30 Nov 2022 22:07:44 +0000
From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
To: Jesper Dangaard Brouer <hawk@...nel.org>,
Ilias Apalodimas <ilias.apalodimas@...aro.org>
Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>,
netdev@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH 05/24] page_pool: Start using netmem in allocation path.
Convert __page_pool_alloc_page_order() and __page_pool_alloc_pages_slow()
to use netmem internally. This removes a couple of calls
to compound_head() that are hidden inside put_page().
Convert trace_page_pool_state_hold(), page_pool_dma_map() and
page_pool_set_pp_info() to take a netmem argument.
Saves 83 bytes of text in __page_pool_alloc_page_order() and 98 in
__page_pool_alloc_pages_slow() for a total of 181 bytes.
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
include/trace/events/page_pool.h | 14 +++++------
net/core/page_pool.c | 42 +++++++++++++++++---------------
2 files changed, 29 insertions(+), 27 deletions(-)
diff --git a/include/trace/events/page_pool.h b/include/trace/events/page_pool.h
index 113aad0c9e5b..d1237a7ce481 100644
--- a/include/trace/events/page_pool.h
+++ b/include/trace/events/page_pool.h
@@ -67,26 +67,26 @@ TRACE_EVENT(page_pool_state_release,
TRACE_EVENT(page_pool_state_hold,
TP_PROTO(const struct page_pool *pool,
- const struct page *page, u32 hold),
+ const struct netmem *nmem, u32 hold),
- TP_ARGS(pool, page, hold),
+ TP_ARGS(pool, nmem, hold),
TP_STRUCT__entry(
__field(const struct page_pool *, pool)
- __field(const struct page *, page)
+ __field(const struct netmem *, nmem)
__field(u32, hold)
__field(unsigned long, pfn)
),
TP_fast_assign(
__entry->pool = pool;
- __entry->page = page;
+ __entry->nmem = nmem;
__entry->hold = hold;
- __entry->pfn = page_to_pfn(page);
+ __entry->pfn = netmem_pfn(nmem);
),
- TP_printk("page_pool=%p page=%p pfn=0x%lx hold=%u",
- __entry->pool, __entry->page, __entry->pfn, __entry->hold)
+ TP_printk("page_pool=%p netmem=%p pfn=0x%lx hold=%u",
+ __entry->pool, __entry->nmem, __entry->pfn, __entry->hold)
);
TRACE_EVENT(page_pool_update_nid,
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 437241aba5a7..4e985502c569 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -304,8 +304,9 @@ static void page_pool_dma_sync_for_device(struct page_pool *pool,
pool->p.dma_dir);
}
-static bool page_pool_dma_map(struct page_pool *pool, struct page *page)
+static bool page_pool_dma_map(struct page_pool *pool, struct netmem *nmem)
{
+ struct page *page = netmem_page(nmem);
dma_addr_t dma;
/* Setup DMA mapping: use 'struct page' area for storing DMA-addr
@@ -328,12 +329,12 @@ static bool page_pool_dma_map(struct page_pool *pool, struct page *page)
}
static void page_pool_set_pp_info(struct page_pool *pool,
- struct page *page)
+ struct netmem *nmem)
{
- page->pp = pool;
- page->pp_magic |= PP_SIGNATURE;
+ nmem->pp = pool;
+ nmem->pp_magic |= PP_SIGNATURE;
if (pool->p.init_callback)
- pool->p.init_callback(page, pool->p.init_arg);
+ pool->p.init_callback(netmem_page(nmem), pool->p.init_arg);
}
static void page_pool_clear_pp_info(struct netmem *nmem)
@@ -345,26 +346,26 @@ static void page_pool_clear_pp_info(struct netmem *nmem)
static struct page *__page_pool_alloc_page_order(struct page_pool *pool,
gfp_t gfp)
{
- struct page *page;
+ struct netmem *nmem;
gfp |= __GFP_COMP;
- page = alloc_pages_node(pool->p.nid, gfp, pool->p.order);
- if (unlikely(!page))
+ nmem = page_netmem(alloc_pages_node(pool->p.nid, gfp, pool->p.order));
+ if (unlikely(!nmem))
return NULL;
if ((pool->p.flags & PP_FLAG_DMA_MAP) &&
- unlikely(!page_pool_dma_map(pool, page))) {
- put_page(page);
+ unlikely(!page_pool_dma_map(pool, nmem))) {
+ netmem_put(nmem);
return NULL;
}
alloc_stat_inc(pool, slow_high_order);
- page_pool_set_pp_info(pool, page);
+ page_pool_set_pp_info(pool, nmem);
/* Track how many pages are held 'in-flight' */
pool->pages_state_hold_cnt++;
- trace_page_pool_state_hold(pool, page, pool->pages_state_hold_cnt);
- return page;
+ trace_page_pool_state_hold(pool, nmem, pool->pages_state_hold_cnt);
+ return netmem_page(nmem);
}
/* slow path */
@@ -398,18 +399,18 @@ static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool,
* page element have not been (possibly) DMA mapped.
*/
for (i = 0; i < nr_pages; i++) {
- page = pool->alloc.cache[i];
+ struct netmem *nmem = page_netmem(pool->alloc.cache[i]);
if ((pp_flags & PP_FLAG_DMA_MAP) &&
- unlikely(!page_pool_dma_map(pool, page))) {
- put_page(page);
+ unlikely(!page_pool_dma_map(pool, nmem))) {
+ netmem_put(nmem);
continue;
}
- page_pool_set_pp_info(pool, page);
- pool->alloc.cache[pool->alloc.count++] = page;
+ page_pool_set_pp_info(pool, nmem);
+ pool->alloc.cache[pool->alloc.count++] = netmem_page(nmem);
/* Track how many pages are held 'in-flight' */
pool->pages_state_hold_cnt++;
- trace_page_pool_state_hold(pool, page,
+ trace_page_pool_state_hold(pool, nmem,
pool->pages_state_hold_cnt);
}
@@ -421,7 +422,8 @@ static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool,
page = NULL;
}
- /* When page just alloc'ed is should/must have refcnt 1. */
+ /* When page just allocated it should have refcnt 1 (but may have
+ * speculative references) */
return page;
}
--
2.35.1
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