lkml.org 
[lkml]   [2020]   [May]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
Subject[PATCH] net/packet: simply allocations in alloc_one_pg_vec_page
From
Currently the initial allocation for pg_vec buffers are done through
page allocator with __GFP_NORETRY, the first fallbacks is vzalloc and
the second fallback is page allocator without __GFP_NORETRY.

First, there is no need to do vzalloc if the order is 0 and second the
vzalloc internally use GFP_KERNEL for each individual page allocation
and thus there is no need to have any fallback after vzalloc.

Signed-off-by: Shakeel Butt <shakeelb@google.com>
---
net/packet/af_packet.c | 15 ++++-----------
1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 29bd405adbbd..d6f96b9f5b01 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -4243,19 +4243,12 @@ static char *alloc_one_pg_vec_page(unsigned long order)
if (buffer)
return buffer;

- /* __get_free_pages failed, fall back to vmalloc */
- buffer = vzalloc(array_size((1 << order), PAGE_SIZE));
- if (buffer)
- return buffer;
+ /* __get_free_pages failed, fall back to vmalloc for high order. */
+ if (order)
+ return vzalloc(array_size((1 << order), PAGE_SIZE));

- /* vmalloc failed, lets dig into swap here */
gfp_flags &= ~__GFP_NORETRY;
- buffer = (char *) __get_free_pages(gfp_flags, order);
- if (buffer)
- return buffer;
-
- /* complete and utter failure */
- return NULL;
+ return (char *)__get_free_pages(gfp_flags, order);
}

static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order)
--
2.26.2.761.g0e0b3e54be-goog
\
 
 \ /
  Last update: 2020-05-16 04:18    [W:0.071 / U:0.084 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site