linux-kernel - Re: [PATCH] proc: mm: export PTE sizes directly in smaps (v2)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 28 Nov 2016 08:52:43 -0800
From:   Dave Hansen <dave@...1.net>
To:     Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org
Cc:     hch@....de, akpm@...ux-foundation.org, dan.j.williams@...el.com,
        khandual@...ux.vnet.ibm.com, linux-mm@...ck.org
Subject: Re: [PATCH] proc: mm: export PTE sizes directly in smaps (v2)

On 11/24/2016 06:22 AM, Vlastimil Babka wrote:
> On 11/17/2016 01:28 AM, Dave Hansen wrote:
>> @@ -702,11 +707,13 @@ static int smaps_hugetlb_range(pte_t *pt
>>      }
>>      if (page) {
>>          int mapcount = page_mapcount(page);
>> +        unsigned long hpage_size = huge_page_size(hstate_vma(vma));
>>
>> +        mss->rss_pud += hpage_size;
> 
> This hardcoded pud doesn't look right, doesn't the pmd/pud depend on
> hpage_size?

Urg, nope.  Thanks for noticing that!  I think we'll need something
along the lines of:

                if (hpage_size == PUD_SIZE)
                        mss->rss_pud += PUD_SIZE;
                else if (hpage_size == PMD_SIZE)
                        mss->rss_pmd += PMD_SIZE;

I'll respin and resend.