diff options
Diffstat (limited to 'target/linux/generic/backport-4.9/040-mm-add-support-for-releasing-multiple-instances-of-a.patch')
| -rw-r--r-- | target/linux/generic/backport-4.9/040-mm-add-support-for-releasing-multiple-instances-of-a.patch | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/target/linux/generic/backport-4.9/040-mm-add-support-for-releasing-multiple-instances-of-a.patch b/target/linux/generic/backport-4.9/040-mm-add-support-for-releasing-multiple-instances-of-a.patch new file mode 100644 index 0000000..84714ce --- /dev/null +++ b/target/linux/generic/backport-4.9/040-mm-add-support-for-releasing-multiple-instances-of-a.patch @@ -0,0 +1,75 @@ +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 +@@ -3946,6 +3946,20 @@ 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) + { |