From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f70.google.com (mail-wm0-f70.google.com [74.125.82.70]) by kanga.kvack.org (Postfix) with ESMTP id 3C5EF6B0317 for ; Wed, 24 May 2017 07:20:30 -0400 (EDT) Received: by mail-wm0-f70.google.com with SMTP id g143so37710293wme.13 for ; Wed, 24 May 2017 04:20:30 -0700 (PDT) Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com. [148.163.158.5]) by mx.google.com with ESMTPS id i24si19777395wrb.104.2017.05.24.04.20.28 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 24 May 2017 04:20:29 -0700 (PDT) Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v4OB9iKx122455 for ; Wed, 24 May 2017 07:20:27 -0400 Received: from e06smtp13.uk.ibm.com (e06smtp13.uk.ibm.com [195.75.94.109]) by mx0b-001b2d01.pphosted.com with ESMTP id 2an16acjty-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Wed, 24 May 2017 07:20:27 -0400 Received: from localhost by e06smtp13.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 24 May 2017 12:20:25 +0100 From: Laurent Dufour Subject: [RFC v2 08/10] mm: Define mem range lock operations Date: Wed, 24 May 2017 13:19:59 +0200 In-Reply-To: <1495624801-8063-1-git-send-email-ldufour@linux.vnet.ibm.com> References: <1495624801-8063-1-git-send-email-ldufour@linux.vnet.ibm.com> Message-Id: <1495624801-8063-9-git-send-email-ldufour@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org Cc: Davidlohr Bueso , akpm@linux-foundation.org, Jan Kara , "Kirill A . Shutemov" , Michal Hocko , Peter Zijlstra , Mel Gorman , Andi Kleen , haren@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com, khandual@linux.vnet.ibm.com, paulmck@linux.vnet.ibm.com, linux-kernel@vger.kernel.org This patch introduce new mm_down/up*() operation which will run on mmap_sem as a semaphore or as a range lock depending on CONFIG_MEM_RANGE_LOCK. When CONFIG_MEM_RANGE_LOCK is defined, the additional range parameter is used, otherwise it is ignored to avoid any useless additional stack parameter. Signed-off-by: Laurent Dufour --- include/linux/mm.h | 27 +++++++++++++++++++++++++++ include/linux/mm_types.h | 5 +++++ 2 files changed, 32 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index b09048386152..d47b28eb0a53 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include @@ -2588,5 +2589,31 @@ void __init setup_nr_node_ids(void); static inline void setup_nr_node_ids(void) {} #endif +#ifdef CONFIG_MEM_RANGE_LOCK +#define mm_range_define(r) \ + struct range_lock r = __RANGE_LOCK_INITIALIZER(0, RANGE_LOCK_FULL) +#define mm_read_lock(m, r) range_read_lock(&(m)->mmap_sem, r) +#define mm_read_trylock(m, r) range_read_trylock(&(m)->mmap_sem, r) +#define mm_read_unlock(m, r) range_read_unlock(&(m)->mmap_sem, r) +#define mm_write_lock(m, r) range_write_lock(&(m)->mmap_sem, r) +#define mm_write_trylock(m, r) range_write_trylock(&(m)->mmap_sem, r) +#define mm_write_unlock(m, r) range_write_unlock(&(m)->mmap_sem, r) +#define mm_write_lock_killable(m, r) \ + range_write_lock_interruptible(&(m)->mmap_sem, r) +#define mm_downgrade_write(m, r) range_downgrade_write(&(m)->mmap_sem, r) + +#else /* CONFIG_MEM_RANGE_LOCK */ +#define mm_range_define(r) do { } while (0) +#define mm_read_lock(m, r) down_read(&(m)->mmap_sem) +#define mm_read_trylock(m, r) down_read_trylock(&(m)->mmap_sem) +#define mm_read_unlock(m, r) up_read(&(m)->mmap_sem) +#define mm_write_lock(m, r) down_write(&(m)->mmap_sem) +#define mm_write_trylock(m, r) down_write_trylock(&(m)->mmap_sem) +#define mm_write_unlock(m, r) up_write(&(m)->mmap_sem) +#define mm_write_lock_killable(m, r) down_write_killable(&(m)->mmap_sem) +#define mm_downgrade_write(m, r) downgrade_write(&(m)->mmap_sem) + +#endif /* CONFIG_MEM_RANGE_LOCK */ + #endif /* __KERNEL__ */ #endif /* _LINUX_MM_H */ diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 45cdb27791a3..d40611490200 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -403,7 +404,11 @@ struct mm_struct { int map_count; /* number of VMAs */ spinlock_t page_table_lock; /* Protects page tables and some counters */ +#ifdef CONFIG_MEM_RANGE_LOCK + struct range_lock_tree mmap_sem; +#else struct rw_semaphore mmap_sem; +#endif struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung * together off init_mm.mmlist, and are protected -- 2.7.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org