mirror of https://github.com/hak5/openwrt.git
76 lines
2.8 KiB
Diff
76 lines
2.8 KiB
Diff
From: Alexander Duyck <alexander.h.duyck@intel.com>
|
|
Date: Wed, 14 Dec 2016 15:05:26 -0800
|
|
Subject: [PATCH] mm: add support for releasing multiple instances of a page
|
|
|
|
Add a function that allows us to batch free a page that has multiple
|
|
references outstanding. Specifically this function can be used to drop
|
|
a page being used in the page frag alloc cache. With this drivers can
|
|
make use of functionality similar to the page frag alloc cache without
|
|
having to do any workarounds for the fact that there is no function that
|
|
frees multiple references.
|
|
|
|
Link: http://lkml.kernel.org/r/20161110113606.76501.70752.stgit@ahduyck-blue-test.jf.intel.com
|
|
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
|
|
Cc: "David S. Miller" <davem@davemloft.net>
|
|
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
|
|
Cc: Chris Metcalf <cmetcalf@mellanox.com>
|
|
Cc: David Howells <dhowells@redhat.com>
|
|
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
|
|
Cc: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>
|
|
Cc: Helge Deller <deller@gmx.de>
|
|
Cc: James Hogan <james.hogan@imgtec.com>
|
|
Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
|
|
Cc: Jonas Bonn <jonas@southpole.se>
|
|
Cc: Keguang Zhang <keguang.zhang@gmail.com>
|
|
Cc: Ley Foon Tan <lftan@altera.com>
|
|
Cc: Mark Salter <msalter@redhat.com>
|
|
Cc: Max Filippov <jcmvbkbc@gmail.com>
|
|
Cc: Michael Ellerman <mpe@ellerman.id.au>
|
|
Cc: Michal Simek <monstr@monstr.eu>
|
|
Cc: Ralf Baechle <ralf@linux-mips.org>
|
|
Cc: Rich Felker <dalias@libc.org>
|
|
Cc: Richard Kuo <rkuo@codeaurora.org>
|
|
Cc: Russell King <linux@armlinux.org.uk>
|
|
Cc: Steven Miao <realmz6@gmail.com>
|
|
Cc: Tobias Klauser <tklauser@distanz.ch>
|
|
Cc: Vineet Gupta <vgupta@synopsys.com>
|
|
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
|
|
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
|
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
---
|
|
|
|
--- a/include/linux/gfp.h
|
|
+++ b/include/linux/gfp.h
|
|
@@ -506,6 +506,8 @@ extern void free_hot_cold_page(struct pa
|
|
extern void free_hot_cold_page_list(struct list_head *list, bool cold);
|
|
|
|
struct page_frag_cache;
|
|
+extern void __page_frag_drain(struct page *page, unsigned int order,
|
|
+ unsigned int count);
|
|
extern void *__alloc_page_frag(struct page_frag_cache *nc,
|
|
unsigned int fragsz, gfp_t gfp_mask);
|
|
extern void __free_page_frag(void *addr);
|
|
--- a/mm/page_alloc.c
|
|
+++ b/mm/page_alloc.c
|
|
@@ -3945,6 +3945,20 @@ static struct page *__page_frag_refill(s
|
|
return page;
|
|
}
|
|
|
|
+void __page_frag_drain(struct page *page, unsigned int order,
|
|
+ unsigned int count)
|
|
+{
|
|
+ VM_BUG_ON_PAGE(page_ref_count(page) == 0, page);
|
|
+
|
|
+ if (page_ref_sub_and_test(page, count)) {
|
|
+ if (order == 0)
|
|
+ free_hot_cold_page(page, false);
|
|
+ else
|
|
+ __free_pages_ok(page, order);
|
|
+ }
|
|
+}
|
|
+EXPORT_SYMBOL(__page_frag_drain);
|
|
+
|
|
void *__alloc_page_frag(struct page_frag_cache *nc,
|
|
unsigned int fragsz, gfp_t gfp_mask)
|
|
{
|