linux-kernel - [RFC PATCH v4 27/40] mm: Update the freepage migratetype of pages during region allocation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20130925231951.26184.19429.stgit@srivatsabhat.in.ibm.com>
Date:	Thu, 26 Sep 2013 04:49:53 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	akpm@...ux-foundation.org, mgorman@...e.de, dave@...1.net,
	hannes@...xchg.org, tony.luck@...el.com,
	matthew.garrett@...ula.com, riel@...hat.com, arjan@...ux.intel.com,
	srinivas.pandruvada@...ux.intel.com, willy@...ux.intel.com,
	kamezawa.hiroyu@...fujitsu.com, lenb@...nel.org, rjw@...k.pl
Cc:	gargankita@...il.com, paulmck@...ux.vnet.ibm.com,
	svaidy@...ux.vnet.ibm.com, andi@...stfloor.org,
	isimatu.yasuaki@...fujitsu.com, santosh.shilimkar@...com,
	kosaki.motohiro@...il.com, srivatsa.bhat@...ux.vnet.ibm.com,
	linux-pm@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH v4 27/40] mm: Update the freepage migratetype of pages
 during region allocation

The freepage migratetype is used to determine which freelist a given
page should be added to, upon getting freed. To ensure that the page
goes to the right freelist, set the freepage migratetype of all
the pages of a region, when allocating freepages from the region allocator.

This helps ensure that upon freeing the pages or during buddy expansion,
the pages are added back to the freelists of the migratetype for which
the pages were originally requested from the region allocator.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---

 mm/page_alloc.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0d73134..ca7b959 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1023,6 +1023,9 @@ static int del_from_region_allocator(struct zone *zone, unsigned int order,
 	reg_area = &reg_alloc->region[next_region].region_area[order];
 	ralloc_list = &reg_area->list;
 
+	list_for_each_entry(page, ralloc_list, lru)
+		set_freepage_migratetype(page, migratetype);
+
 	free_list = &zone->free_area[order].free_list[migratetype];
 
 	nr_pages = add_to_freelist_bulk(ralloc_list, free_list, order,

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/