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Message-Id: <20120411103516.23245.2700.sendpatchset@srdronam.in.ibm.com>
Date: Wed, 11 Apr 2012 16:05:16 +0530
From: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Ananth N Mavinakayanahalli <ananth@...ibm.com>,
Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
LKML <linux-kernel@...r.kernel.org>,
Linux-mm <linux-mm@...ck.org>, Oleg Nesterov <oleg@...hat.com>,
Andi Kleen <andi@...stfloor.org>,
Christoph Hellwig <hch@...radead.org>,
Steven Rostedt <rostedt@...dmis.org>,
Arnaldo Carvalho de Melo <acme@...radead.org>,
Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
Thomas Gleixner <tglx@...utronix.de>,
Anton Arapov <anton@...hat.com>
Subject: [PATCH 1/2] uprobes/core: Make background page replacement logic account for rss_stat counters
From: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Background page replacement logic adds a new anonymous page instead of a
filebacked(while inserting a breakpoint) / anonymous page(while removing a
breakpoint). Hence logic should take care to update the rss_stat counters
accordingly. This bug became apparent courtesy commit c3f0327f8e9d7
Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
---
kernel/events/uprobes.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 29e881b..c5caeec 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -160,6 +160,11 @@ static int __replace_page(struct vm_area_struct *vma, struct page *page, struct
get_page(kpage);
page_add_new_anon_rmap(kpage, vma, addr);
+ if (!PageAnon(page)) {
+ dec_mm_counter(mm, MM_FILEPAGES);
+ inc_mm_counter(mm, MM_ANONPAGES);
+ }
+
flush_cache_page(vma, addr, pte_pfn(*ptep));
ptep_clear_flush(vma, addr, ptep);
set_pte_at_notify(mm, addr, ptep, mk_pte(kpage, vma->vm_page_prot));
--
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