From: Dave Hansen <dave.hansen@intel.com>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>,
Wu Fengguang <fengguang.wu@intel.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Borislav Petkov <bp@alien8.de>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Johannes Weiner <hannes@cmpxchg.org>,
Rusty Russell <rusty@rustcorp.com.au>,
David Miller <davem@davemloft.net>,
Andres Freund <andres@2ndquadrant.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH 2/3] mm: introduce fincore()
Date: Mon, 02 Jun 2014 09:11:37 -0700 [thread overview]
Message-ID: <538CA239.3060506@intel.com> (raw)
In-Reply-To: <1401686699-9723-3-git-send-email-n-horiguchi@ah.jp.nec.com>
On 06/01/2014 10:24 PM, Naoya Horiguchi wrote:
> Detail about the data format being passed to userspace are explained in
> inline comment, but generally in long entry format, we can choose which
> information is extraced flexibly, so you don't have to waste memory by
> extracting unnecessary information. And with FINCORE_SKIP_HOLE flag,
> we can skip hole pages (not on memory,) which makes us avoid a flood of
> meaningless zero entries when calling on extremely large (but only few
> pages of it are loaded on memory) file.
Something similar could be useful for hugetlbfs too. For a 1GB page,
it's pretty silly to do 2^18 entries which essentially repeat the same
data in an interface like this.
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WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave.hansen@intel.com>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>,
Wu Fengguang <fengguang.wu@intel.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Borislav Petkov <bp@alien8.de>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Johannes Weiner <hannes@cmpxchg.org>,
Rusty Russell <rusty@rustcorp.com.au>,
David Miller <davem@davemloft.net>,
Andres Freund <andres@2ndquadrant.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH 2/3] mm: introduce fincore()
Date: Mon, 02 Jun 2014 09:11:37 -0700 [thread overview]
Message-ID: <538CA239.3060506@intel.com> (raw)
In-Reply-To: <1401686699-9723-3-git-send-email-n-horiguchi@ah.jp.nec.com>
On 06/01/2014 10:24 PM, Naoya Horiguchi wrote:
> Detail about the data format being passed to userspace are explained in
> inline comment, but generally in long entry format, we can choose which
> information is extraced flexibly, so you don't have to waste memory by
> extracting unnecessary information. And with FINCORE_SKIP_HOLE flag,
> we can skip hole pages (not on memory,) which makes us avoid a flood of
> meaningless zero entries when calling on extremely large (but only few
> pages of it are loaded on memory) file.
Something similar could be useful for hugetlbfs too. For a 1GB page,
it's pretty silly to do 2^18 entries which essentially repeat the same
data in an interface like this.
next prev parent reply other threads:[~2014-06-02 16:11 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-21 2:26 [PATCH 0/4] pagecache scanning with /proc/kpagecache Naoya Horiguchi
2014-05-21 2:26 ` Naoya Horiguchi
2014-05-21 2:26 ` [PATCH 1/4] radix-tree: add end_index to support ranged iteration Naoya Horiguchi
2014-05-21 2:26 ` Naoya Horiguchi
2014-05-21 8:21 ` Konstantin Khlebnikov
2014-05-21 8:21 ` Konstantin Khlebnikov
2014-05-21 19:26 ` Naoya Horiguchi
2014-05-21 2:26 ` [PATCH 2/4] fs/proc/page.c: introduce /proc/kpagecache interface Naoya Horiguchi
2014-05-21 2:26 ` Naoya Horiguchi
2014-05-21 2:26 ` [PATCH 3/4] tools/vm/page-types.c: rework on file cache scanning mode Naoya Horiguchi
2014-05-21 2:26 ` Naoya Horiguchi
2014-05-21 2:26 ` [PATCH 4/4] Documentation: update Documentation/vm/pagemap.txt Naoya Horiguchi
2014-05-21 2:26 ` Naoya Horiguchi
2014-05-21 22:42 ` [PATCH 0/4] pagecache scanning with /proc/kpagecache Andrew Morton
2014-05-21 22:42 ` Andrew Morton
2014-05-22 2:19 ` Naoya Horiguchi
[not found] ` <537d5ee4.4914e00a.5672.ffff85d5SMTPIN_ADDED_BROKEN@mx.google.com>
2014-05-22 2:33 ` Andrew Morton
2014-05-22 2:33 ` Andrew Morton
2014-05-22 9:50 ` Konstantin Khlebnikov
2014-05-22 9:50 ` Konstantin Khlebnikov
2014-05-22 10:36 ` Kirill A. Shutemov
2014-05-22 10:36 ` Kirill A. Shutemov
2014-05-22 17:47 ` Naoya Horiguchi
2014-05-22 21:02 ` Naoya Horiguchi
2014-06-02 5:24 ` [RFC][PATCH 0/3] mm: introduce fincore() Naoya Horiguchi
2014-06-02 5:24 ` Naoya Horiguchi
2014-06-02 5:24 ` [PATCH 1/3] replace PAGECACHE_TAG_* definition with enumeration Naoya Horiguchi
2014-06-02 5:24 ` Naoya Horiguchi
2014-06-02 16:12 ` Dave Hansen
2014-06-02 16:12 ` Dave Hansen
2014-06-02 16:37 ` Naoya Horiguchi
[not found] ` <1401727052-f7v7kykv@n-horiguchi@ah.jp.nec.com>
2014-06-02 16:45 ` Dave Hansen
2014-06-02 16:45 ` Dave Hansen
2014-06-02 17:14 ` Naoya Horiguchi
2014-06-02 18:19 ` Dave Hansen
2014-06-02 18:19 ` Dave Hansen
2014-06-02 18:48 ` Naoya Horiguchi
2014-06-02 21:16 ` Andrew Morton
2014-06-02 21:16 ` Andrew Morton
2014-06-02 21:51 ` Naoya Horiguchi
2014-06-02 5:24 ` [PATCH 2/3] mm: introduce fincore() Naoya Horiguchi
2014-06-02 5:24 ` Naoya Horiguchi
[not found] ` <1401686699-9723-3-git-send-email-n-horiguchi-PaJj6Psr51x8UrSeD/g0lQ@public.gmane.org>
2014-06-02 6:42 ` Christoph Hellwig
2014-06-02 6:42 ` Christoph Hellwig
2014-06-02 6:42 ` Christoph Hellwig
2014-06-02 14:19 ` Naoya Horiguchi
2014-06-02 7:06 ` Michael Kerrisk
2014-06-02 7:06 ` Michael Kerrisk
2014-06-02 7:06 ` Michael Kerrisk
2014-06-02 14:21 ` Naoya Horiguchi
2014-06-02 12:23 ` Kirill A. Shutemov
2014-06-02 12:23 ` Kirill A. Shutemov
2014-06-02 14:52 ` Naoya Horiguchi
2014-06-02 16:11 ` Dave Hansen [this message]
2014-06-02 16:11 ` Dave Hansen
2014-06-02 16:22 ` Naoya Horiguchi
2014-06-02 5:24 ` [PATCH 3/3] selftest: add test code for fincore() Naoya Horiguchi
2014-06-02 5:24 ` Naoya Horiguchi
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