From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx188.postini.com [74.125.245.188]) by kanga.kvack.org (Postfix) with SMTP id 5931E6B004D for ; Mon, 30 Apr 2012 07:29:12 -0400 (EDT) Received: by mail-lb0-f169.google.com with SMTP id n8so1941883lbj.14 for ; Mon, 30 Apr 2012 04:29:11 -0700 (PDT) Subject: [PATCH RFC 2/3] proc/smaps: show amount of nonlinear ptes in vma From: Konstantin Khlebnikov Date: Mon, 30 Apr 2012 15:29:07 +0400 Message-ID: <20120430112907.14137.18910.stgit@zurg> In-Reply-To: <20120430112903.14137.81692.stgit@zurg> References: <20120430112903.14137.81692.stgit@zurg> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Andrew Morton Currently, nonlinear mappings can not be distinguished from ordinary mappings. This patch adds into /proc/pid/smaps line "Nonlinear: kB", where size is amount of nonlinear ptes in vma, this line appears only if VM_NONLINEAR is set. This information may be useful not only for checkpoint/restore project. Signed-off-by: Konstantin Khlebnikov Requested-by: Pavel Emelyanov --- fs/proc/task_mmu.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index acee5fd..b1d9729 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -393,6 +393,7 @@ struct mem_size_stats { unsigned long anonymous; unsigned long anonymous_thp; unsigned long swap; + unsigned long nonlinear; u64 pss; }; @@ -402,6 +403,7 @@ static void smaps_pte_entry(pte_t ptent, unsigned long addr, { struct mem_size_stats *mss = walk->private; struct vm_area_struct *vma = mss->vma; + pgoff_t pgoff = linear_page_index(vma, addr); struct page *page = NULL; int mapcount; @@ -414,6 +416,9 @@ static void smaps_pte_entry(pte_t ptent, unsigned long addr, mss->swap += ptent_size; else if (is_migration_entry(swpent)) page = migration_entry_to_page(swpent); + } else if (pte_file(ptent)) { + if (pte_to_pgoff(ptent) != pgoff) + mss->nonlinear += ptent_size; } if (!page) @@ -422,6 +427,9 @@ static void smaps_pte_entry(pte_t ptent, unsigned long addr, if (PageAnon(page)) mss->anonymous += ptent_size; + if (page->index != pgoff) + mss->nonlinear += ptent_size; + mss->resident += ptent_size; /* Accumulate the size in pages that have been accessed. */ if (pte_young(ptent) || PageReferenced(page)) @@ -523,6 +531,10 @@ static int show_smap(struct seq_file *m, void *v, int is_pid) (vma->vm_flags & VM_LOCKED) ? (unsigned long)(mss.pss >> (10 + PSS_SHIFT)) : 0); + if (vma->vm_flags & VM_NONLINEAR) + seq_printf(m, "Nonlinear: %8lu kB\n", + mss.nonlinear >> 10); + if (m->count < m->size) /* vma is copied successfully */ m->version = (vma != get_gate_vma(task->mm)) ? vma->vm_start : 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org