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Message-Id: <1495624801-8063-11-git-send-email-ldufour@linux.vnet.ibm.com>
Date: Wed, 24 May 2017 13:20:01 +0200
From: Laurent Dufour <ldufour@...ux.vnet.ibm.com>
To: linux-mm@...ck.org
Cc: Davidlohr Bueso <dave@...olabs.net>, akpm@...ux-foundation.org,
Jan Kara <jack@...e.cz>,
"Kirill A . Shutemov" <kirill@...temov.name>,
Michal Hocko <mhocko@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Mel Gorman <mgorman@...hsingularity.net>,
Andi Kleen <andi@...stfloor.org>, haren@...ux.vnet.ibm.com,
aneesh.kumar@...ux.vnet.ibm.com, khandual@...ux.vnet.ibm.com,
paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org
Subject: [RFC v2 10/10] mm: Introduce CONFIG_MEM_RANGE_LOCK
A new configuration variable is introduced to activate the use of
range lock instead of semaphore to protect per process memory layout.
This range lock is replacing the use of a semaphore for mmap_sem.
Currently only available for X86_64 and PPC64 architectures.
By default this option is turned off and requires the EXPERT mode
since it is not yet complete.
Signed-off-by: Laurent Dufour <ldufour@...ux.vnet.ibm.com>
---
mm/Kconfig | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/mm/Kconfig b/mm/Kconfig
index beb7a455915d..955d9a735a49 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -309,6 +309,18 @@ config NEED_BOUNCE_POOL
bool
default y if TILE && USB_OHCI_HCD
+config MEM_RANGE_LOCK
+ bool "Use range lock for process's memory layout"
+ default n
+ depends on EXPERT
+ depends on MMU
+ depends on X86_64 || PPC64
+ help
+ Use range lock instead of traditional semaphore to protect per
+ process memory layout. This is required when dealing with massive
+ threaded process on very large system (more than 80 cpu threads).
+ If unsure say n.
+
config NR_QUICK
int
depends on QUICKLIST
--
2.7.4
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