From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-f197.google.com (mail-qt0-f197.google.com [209.85.216.197]) by kanga.kvack.org (Postfix) with ESMTP id 884ED6B0365 for ; Tue, 27 Jun 2017 06:12:54 -0400 (EDT) Received: by mail-qt0-f197.google.com with SMTP id 50so10473856qtz.3 for ; Tue, 27 Jun 2017 03:12:54 -0700 (PDT) Received: from mail-qt0-x242.google.com (mail-qt0-x242.google.com. [2607:f8b0:400d:c0d::242]) by mx.google.com with ESMTPS id x188si2347083qkd.218.2017.06.27.03.12.53 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 27 Jun 2017 03:12:53 -0700 (PDT) Received: by mail-qt0-x242.google.com with SMTP id v31so3166857qtb.3 for ; Tue, 27 Jun 2017 03:12:53 -0700 (PDT) From: Ram Pai Subject: [RFC v4 17/17] procfs: display the protection-key number associated with a vma Date: Tue, 27 Jun 2017 03:11:59 -0700 Message-Id: <1498558319-32466-18-git-send-email-linuxram@us.ibm.com> In-Reply-To: <1498558319-32466-1-git-send-email-linuxram@us.ibm.com> References: <1498558319-32466-1-git-send-email-linuxram@us.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com, bsingharora@gmail.com, dave.hansen@intel.com, hbabu@us.ibm.com, linuxram@us.ibm.com, arnd@arndb.de, akpm@linux-foundation.org, corbet@lwn.net, mingo@redhat.com Display the pkey number associated with the vma in smaps of a task. The key will be seen as below: VmFlags: rd wr mr mw me dw ac key=0 Signed-off-by: Ram Pai --- Documentation/filesystems/proc.txt | 3 ++- fs/proc/task_mmu.c | 22 +++++++++++----------- 2 files changed, 13 insertions(+), 12 deletions(-) diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt index 4cddbce..a8c74aa 100644 --- a/Documentation/filesystems/proc.txt +++ b/Documentation/filesystems/proc.txt @@ -423,7 +423,7 @@ SwapPss: 0 kB KernelPageSize: 4 kB MMUPageSize: 4 kB Locked: 0 kB -VmFlags: rd ex mr mw me dw +VmFlags: rd ex mr mw me dw key= the first of these lines shows the same information as is displayed for the mapping in /proc/PID/maps. The remaining lines show the size of the mapping @@ -491,6 +491,7 @@ manner. The codes are the following: hg - huge page advise flag nh - no-huge page advise flag mg - mergable advise flag + key= - the memory protection key number Note that there is no guarantee that every flag and associated mnemonic will be present in all further kernel releases. Things get changed, the flags may diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 2ddc298..d2eb096 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -1,4 +1,6 @@ #include +#include +#include #include #include #include @@ -666,22 +668,20 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) [ilog2(VM_MERGEABLE)] = "mg", [ilog2(VM_UFFD_MISSING)]= "um", [ilog2(VM_UFFD_WP)] = "uw", -#ifdef CONFIG_ARCH_HAS_PKEYS - /* These come out via ProtectionKey: */ - [ilog2(VM_PKEY_BIT0)] = "", - [ilog2(VM_PKEY_BIT1)] = "", - [ilog2(VM_PKEY_BIT2)] = "", - [ilog2(VM_PKEY_BIT3)] = "", -#endif /* CONFIG_ARCH_HAS_PKEYS */ -#ifdef CONFIG_PPC64_MEMORY_PROTECTION_KEYS - /* Additional bit in ProtectionKey: */ - [ilog2(VM_PKEY_BIT4)] = "", -#endif }; size_t i; seq_puts(m, "VmFlags: "); for (i = 0; i < BITS_PER_LONG; i++) { +#ifdef CONFIG_ARCH_HAS_PKEYS + if (i == ilog2(VM_PKEY_BIT0)) { + int keyvalue = vma_pkey(vma); + + i += ilog2(arch_max_pkey())-1; + seq_printf(m, "key=%d ", keyvalue); + continue; + } +#endif /* CONFIG_ARCH_HAS_PKEYS */ if (!mnemonics[i][0]) continue; if (vma->vm_flags & (1UL << i)) { -- 1.8.3.1 -- 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