From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id 509FC6B003D for ; Thu, 10 Dec 2009 03:06:37 -0500 (EST) Received: from m3.gw.fujitsu.co.jp ([10.0.50.73]) by fgwmail6.fujitsu.co.jp (Fujitsu Gateway) with ESMTP id nBA86XFh026522 for (envelope-from kamezawa.hiroyu@jp.fujitsu.com); Thu, 10 Dec 2009 17:06:33 +0900 Received: from smail (m3 [127.0.0.1]) by outgoing.m3.gw.fujitsu.co.jp (Postfix) with ESMTP id 18C7C45DE51 for ; Thu, 10 Dec 2009 17:06:33 +0900 (JST) Received: from s3.gw.fujitsu.co.jp (s3.gw.fujitsu.co.jp [10.0.50.93]) by m3.gw.fujitsu.co.jp (Postfix) with ESMTP id E1BEF45DE50 for ; Thu, 10 Dec 2009 17:06:32 +0900 (JST) Received: from s3.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s3.gw.fujitsu.co.jp (Postfix) with ESMTP id AFF721DB8041 for ; Thu, 10 Dec 2009 17:06:32 +0900 (JST) Received: from m106.s.css.fujitsu.com (m106.s.css.fujitsu.com [10.249.87.106]) by s3.gw.fujitsu.co.jp (Postfix) with ESMTP id 554731DB8038 for ; Thu, 10 Dec 2009 17:06:32 +0900 (JST) Date: Thu, 10 Dec 2009 17:03:39 +0900 From: KAMEZAWA Hiroyuki Subject: Re: [RFC mm][PATCH 0/5] per mm counter updates Message-Id: <20091210170339.072b24a7.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <20091210163115.463d96a3.kamezawa.hiroyu@jp.fujitsu.com> References: <20091210163115.463d96a3.kamezawa.hiroyu@jp.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: KAMEZAWA Hiroyuki Cc: "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , cl@linux-foundation.org, "akpm@linux-foundation.org" , minchan.kim@gmail.com, mingo@elte.hu List-ID: This is test program I used. This is tuned for 4core/socket. == /* * multi-fault.c :: causes 60secs of parallel page fault in multi-thread. * % gcc -O2 -o multi-fault multi-fault.c -lpthread * % multi-fault # of cpus. */ #define _GNU_SOURCE #include #include #include #include #include #include #include #include #define CORE_PER_SOCK 4 #define NR_THREADS 8 pthread_t threads[NR_THREADS]; /* * For avoiding contention in page table lock, FAULT area is * sparse. If FAULT_LENGTH is too large for your cpus, decrease it. */ #define MMAP_LENGTH (8 * 1024 * 1024) #define FAULT_LENGTH (2 * 1024 * 1024) void *mmap_area[NR_THREADS]; #define PAGE_SIZE 4096 pthread_barrier_t barrier; int name[NR_THREADS]; void segv_handler(int sig) { sleep(100); } void *worker(void *data) { cpu_set_t set; int cpu; cpu = *(int *)data; CPU_ZERO(&set); CPU_SET(cpu, &set); sched_setaffinity(0, sizeof(set), &set); cpu /= CORE_PER_SOCK; while (1) { char *c; char *start = mmap_area[cpu]; char *end = mmap_area[cpu] + FAULT_LENGTH; pthread_barrier_wait(&barrier); //printf("fault into %p-%p\n",start, end); for (c = start; c < end; c += PAGE_SIZE) *c = 0; pthread_barrier_wait(&barrier); madvise(start, FAULT_LENGTH, MADV_DONTNEED); } return NULL; } int main(int argc, char *argv[]) { int i, ret; unsigned int num; if (argc < 2) return 0; num = atoi(argv[1]); pthread_barrier_init(&barrier, NULL, num); mmap_area[0] = mmap(NULL, MMAP_LENGTH * num, PROT_WRITE|PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0); for (i = 1; i < num; i++) { mmap_area[i] = mmap_area[i - 1]+ MMAP_LENGTH; } for (i = 0; i < num; ++i) { name[i] = i * CORE_PER_SOCK; ret = pthread_create(&threads[i], NULL, worker, &name[i]); if (ret < 0) { perror("pthread create"); return 0; } } sleep(60); return 0; } -- 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