From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S939838AbdEXLUm (ORCPT ); Wed, 24 May 2017 07:20:42 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:57982 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759961AbdEXLU3 (ORCPT ); Wed, 24 May 2017 07:20:29 -0400 From: Laurent Dufour 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 Subject: [RFC v2 08/10] mm: Define mem range lock operations Date: Wed, 24 May 2017 13:19:59 +0200 X-Mailer: git-send-email 2.7.4 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> X-TM-AS-GCONF: 00 x-cbid: 17052411-0012-0000-0000-0000053867AC X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17052411-0013-0000-0000-0000189A5CC0 Message-Id: <1495624801-8063-9-git-send-email-ldufour@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-05-24_08:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1703280000 definitions=main-1705240054 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: 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