Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933628Ab2EYRLO (ORCPT ); Fri, 25 May 2012 13:11:14 -0400 Received: from mx1.redhat.com ([209.132.183.28]:12117 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932140Ab2EYRD3 (ORCPT ); Fri, 25 May 2012 13:03:29 -0400 From: Andrea Arcangeli To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Hillf Danton , Dan Smith , Peter Zijlstra , Linus Torvalds , Andrew Morton , Thomas Gleixner , Ingo Molnar , Paul Turner , Suresh Siddha , Mike Galbraith , "Paul E. McKenney" , Lai Jiangshan , Bharata B Rao , Lee Schermerhorn , Rik van Riel , Johannes Weiner , Srivatsa Vaddagiri , Christoph Lameter Subject: [PATCH 19/35] autonuma: alloc/free/init mm_autonuma Date: Fri, 25 May 2012 19:02:23 +0200 Message-Id: <1337965359-29725-20-git-send-email-aarcange@redhat.com> In-Reply-To: <1337965359-29725-1-git-send-email-aarcange@redhat.com> References: <1337965359-29725-1-git-send-email-aarcange@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2098 Lines: 64 This is where the mm_autonuma structure is being handled. Just like sched_autonuma, this is only allocated at runtime if the hardware the kernel is running on has been detected as NUMA. On not NUMA hardware the memory cost is reduced to one pointer per mm. To get rid of the pointer in the each mm, the kernel can be compiled with CONFIG_AUTONUMA=n. Signed-off-by: Andrea Arcangeli --- kernel/fork.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/kernel/fork.c b/kernel/fork.c index d323eb1..22f102e 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -526,6 +526,8 @@ static void mm_init_aio(struct mm_struct *mm) static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p) { + if (unlikely(alloc_mm_autonuma(mm))) + goto out_free_mm; atomic_set(&mm->mm_users, 1); atomic_set(&mm->mm_count, 1); init_rwsem(&mm->mmap_sem); @@ -548,6 +550,8 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p) return mm; } + free_mm_autonuma(mm); +out_free_mm: free_mm(mm); return NULL; } @@ -597,6 +601,7 @@ void __mmdrop(struct mm_struct *mm) destroy_context(mm); mmu_notifier_mm_destroy(mm); check_mm(mm); + free_mm_autonuma(mm); free_mm(mm); } EXPORT_SYMBOL_GPL(__mmdrop); @@ -880,6 +885,7 @@ fail_nocontext: * If init_new_context() failed, we cannot use mmput() to free the mm * because it calls destroy_context() */ + free_mm_autonuma(mm); mm_free_pgd(mm); free_mm(mm); return NULL; @@ -1706,6 +1712,7 @@ void __init proc_caches_init(void) mm_cachep = kmem_cache_create("mm_struct", sizeof(struct mm_struct), ARCH_MIN_MMSTRUCT_ALIGN, SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK, NULL); + mm_autonuma_init(); vm_area_cachep = KMEM_CACHE(vm_area_struct, SLAB_PANIC); mmap_init(); nsproxy_cache_init(); -- 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/