linux-kernel - [RFC] mm:change /proc/smaps caculation behavior

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-next>] [day] [month] [year] [list]

Date:	Fri, 30 Jan 2015 14:14:30 +0800
From:	"Wang, Yalin" <Yalin.Wang@...ymobile.com>
To:	"'akpm@...ux-foundation.org'" <akpm@...ux-foundation.org>,
	"'kirill.shutemov@...ux.intel.com'" <kirill.shutemov@...ux.intel.com>,
	"'oleg@...hat.com'" <oleg@...hat.com>,
	"'gorcunov@...nvz.org'" <gorcunov@...nvz.org>,
	"'n-horiguchi@...jp.nec.com'" <n-horiguchi@...jp.nec.com>,
	"'pfeiner@...gle.com'" <pfeiner@...gle.com>,
	"'aquini@...hat.com'" <aquini@...hat.com>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>
Subject: [RFC] mm:change /proc/smaps caculation behavior

This patch change smaps pagetable walk behavior, to make
sure not skip VM_PFNMAP pagetables,
so that we can calculate COW pages of VM_PFNMAP as normal pages.

Signed-off-by: Yalin Wang <yalin.wang@...ymobile.com>
---
 fs/proc/task_mmu.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index c7267e9..00a5b73 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -503,6 +503,15 @@ static void smaps_pte_entry(pte_t *pte, unsigned long addr,
 	smaps_account(mss, page, PAGE_SIZE, pte_young(*pte), pte_dirty(*pte));
 }
 
+static int smaps_test_walk(unsigned long addr, unsigned long next,
+		struct mm_walk *walk)
+{
+	/*
+	 * don't skip VM_PFNMAP, so that we can caculate some COW pages.
+	 */
+	return 0;
+}
+
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
 		struct mm_walk *walk)
@@ -616,6 +625,7 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
 	struct mem_size_stats mss;
 	struct mm_walk smaps_walk = {
 		.pmd_entry = smaps_pte_range,
+		.test_walk = smaps_test_walk,
 		.mm = vma->vm_mm,
 		.private = &mss,
 	};
-- 
2.2.2
--
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/