Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753111AbbG2PnH (ORCPT ); Wed, 29 Jul 2015 11:43:07 -0400 Received: from prod-mail-xrelay08.akamai.com ([96.6.114.112]:13622 "EHLO prod-mail-xrelay08.akamai.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751154AbbG2PnE (ORCPT ); Wed, 29 Jul 2015 11:43:04 -0400 From: Eric B Munson To: Andrew Morton Cc: Eric B Munson , Michal Hocko , Vlastimil Babka , "Kirill A. Shutemov" , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH V6 1/6] mm: mlock: Refactor mlock, munlock, and munlockall code Date: Wed, 29 Jul 2015 11:42:50 -0400 Message-Id: <1438184575-10537-2-git-send-email-emunson@akamai.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1438184575-10537-1-git-send-email-emunson@akamai.com> References: <1438184575-10537-1-git-send-email-emunson@akamai.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3893 Lines: 129 Extending the mlock system call is very difficult because it currently does not take a flags argument. A later patch in this set will extend mlock to support a middle ground between pages that are locked and faulted in immediately and unlocked pages. To pave the way for the new system call, the code needs some reorganization so that all the actual entry point handles is checking input and translating to VMA flags. Signed-off-by: Eric B Munson Acked-by: Kirill A. Shutemov Cc: Michal Hocko Cc: Vlastimil Babka Cc: "Kirill A. Shutemov" Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org --- mm/mlock.c | 29 ++++++++++++++++------------- 1 file changed, 16 insertions(+), 13 deletions(-) diff --git a/mm/mlock.c b/mm/mlock.c index 6fd2cf1..1585cca 100644 --- a/mm/mlock.c +++ b/mm/mlock.c @@ -553,7 +553,8 @@ out: return ret; } -static int do_mlock(unsigned long start, size_t len, int on) +static int apply_vma_lock_flags(unsigned long start, size_t len, + vm_flags_t flags) { unsigned long nstart, end, tmp; struct vm_area_struct * vma, * prev; @@ -575,14 +576,10 @@ static int do_mlock(unsigned long start, size_t len, int on) prev = vma; for (nstart = start ; ; ) { - vm_flags_t newflags; + vm_flags_t newflags = vma->vm_flags & ~VM_LOCKED; + newflags |= flags; /* Here we know that vma->vm_start <= nstart < vma->vm_end. */ - - newflags = vma->vm_flags & ~VM_LOCKED; - if (on) - newflags |= VM_LOCKED; - tmp = vma->vm_end; if (tmp > end) tmp = end; @@ -604,7 +601,7 @@ static int do_mlock(unsigned long start, size_t len, int on) return error; } -SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len) +static int do_mlock(unsigned long start, size_t len, vm_flags_t flags) { unsigned long locked; unsigned long lock_limit; @@ -628,7 +625,7 @@ SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len) /* check against resource limits */ if ((locked <= lock_limit) || capable(CAP_IPC_LOCK)) - error = do_mlock(start, len, 1); + error = apply_vma_lock_flags(start, len, flags); up_write(¤t->mm->mmap_sem); if (error) @@ -640,6 +637,11 @@ SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len) return 0; } +SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len) +{ + return do_mlock(start, len, VM_LOCKED); +} + SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len) { int ret; @@ -648,13 +650,13 @@ SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len) start &= PAGE_MASK; down_write(¤t->mm->mmap_sem); - ret = do_mlock(start, len, 0); + ret = apply_vma_lock_flags(start, len, 0); up_write(¤t->mm->mmap_sem); return ret; } -static int do_mlockall(int flags) +static int apply_mlockall_flags(int flags) { struct vm_area_struct * vma, * prev = NULL; @@ -662,6 +664,7 @@ static int do_mlockall(int flags) current->mm->def_flags |= VM_LOCKED; else current->mm->def_flags &= ~VM_LOCKED; + if (flags == MCL_FUTURE) goto out; @@ -703,7 +706,7 @@ SYSCALL_DEFINE1(mlockall, int, flags) if (!(flags & MCL_CURRENT) || (current->mm->total_vm <= lock_limit) || capable(CAP_IPC_LOCK)) - ret = do_mlockall(flags); + ret = apply_mlockall_flags(flags); up_write(¤t->mm->mmap_sem); if (!ret && (flags & MCL_CURRENT)) mm_populate(0, TASK_SIZE); @@ -716,7 +719,7 @@ SYSCALL_DEFINE0(munlockall) int ret; down_write(¤t->mm->mmap_sem); - ret = do_mlockall(0); + ret = apply_mlockall_flags(0); up_write(¤t->mm->mmap_sem); return ret; } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/