From: Hugh Dickins <hughd@google.com>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: linux-arch@vger.kernel.org, riel@redhat.com,
Madhavan Srinivasan <maddy@linux.vnet.ibm.com>,
dave.hansen@intel.com, peterz@infradead.org, x86@kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
ak@linux.intel.com, paulus@samba.org, mgorman@suse.de,
akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org,
mingo@kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH V4 0/2] mm: FAULT_AROUND_ORDER patchset performance data for powerpc
Date: Mon, 19 May 2014 19:34:27 -0700 (PDT) [thread overview]
Message-ID: <alpine.LSU.2.11.1405191930130.3574@eggly.anvils> (raw)
In-Reply-To: <87d2f9jlpd.fsf@rustcorp.com.au>
On Tue, 20 May 2014, Rusty Russell wrote:
> Hugh Dickins <hughd@google.com> writes:
> >> On Monday 19 May 2014 05:42 AM, Rusty Russell wrote:
> >> >
> >> > Perhaps we try to generalize from two data points (a slight improvement
> >> > over doing it from 1!), eg:
> >> >
> >> > /* 4 seems good for 4k-page x86, 0 seems good for 64k page ppc64, so: */
> >> > unsigned int fault_around_order __read_mostly =
> >> > (16 - PAGE_SHIFT < 0 ? 0 : 16 - PAGE_SHIFT);
> >
> > Rusty's bimodal answer doesn't seem the right starting point to me.
>
> ? It's not bimodal, it's graded. I think you misread?
Yikes, worse than misread, more like I was too rude even to read: sorry!
Hugh
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WARNING: multiple messages have this Message-ID (diff)
From: Hugh Dickins <hughd@google.com>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-mm@kvack.org, linux-arch@vger.kernel.org, x86@kernel.org,
benh@kernel.crashing.org, paulus@samba.org,
akpm@linux-foundation.org, riel@redhat.com, mgorman@suse.de,
ak@linux.intel.com, peterz@infradead.org, mingo@kernel.org,
dave.hansen@intel.com
Subject: Re: [PATCH V4 0/2] mm: FAULT_AROUND_ORDER patchset performance data for powerpc
Date: Mon, 19 May 2014 19:34:27 -0700 (PDT) [thread overview]
Message-ID: <alpine.LSU.2.11.1405191930130.3574@eggly.anvils> (raw)
Message-ID: <20140520023427.HTLw4DCHhvW2IPLw-HE4kcxMbh1uKvOQ5BXpndg3CXM@z> (raw)
In-Reply-To: <87d2f9jlpd.fsf@rustcorp.com.au>
On Tue, 20 May 2014, Rusty Russell wrote:
> Hugh Dickins <hughd@google.com> writes:
> >> On Monday 19 May 2014 05:42 AM, Rusty Russell wrote:
> >> >
> >> > Perhaps we try to generalize from two data points (a slight improvement
> >> > over doing it from 1!), eg:
> >> >
> >> > /* 4 seems good for 4k-page x86, 0 seems good for 64k page ppc64, so: */
> >> > unsigned int fault_around_order __read_mostly =
> >> > (16 - PAGE_SHIFT < 0 ? 0 : 16 - PAGE_SHIFT);
> >
> > Rusty's bimodal answer doesn't seem the right starting point to me.
>
> ? It's not bimodal, it's graded. I think you misread?
Yikes, worse than misread, more like I was too rude even to read: sorry!
Hugh
next prev parent reply other threads:[~2014-05-20 2:34 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-08 9:28 [PATCH V4 0/2] mm: FAULT_AROUND_ORDER patchset performance data for powerpc Madhavan Srinivasan
2014-05-08 9:28 ` Madhavan Srinivasan
2014-05-08 9:28 ` [PATCH V4 1/2] mm: move FAULT_AROUND_ORDER to arch/ Madhavan Srinivasan
2014-05-08 9:28 ` Madhavan Srinivasan
2014-05-08 9:28 ` [PATCH V4 2/2] powerpc/pseries: init fault_around_order for pseries Madhavan Srinivasan
2014-05-08 9:28 ` Madhavan Srinivasan
2014-05-20 7:28 ` Andrew Morton
2014-05-20 7:28 ` Andrew Morton
2014-05-20 8:03 ` Madhavan Srinivasan
2014-05-20 8:03 ` Madhavan Srinivasan
2014-05-15 8:25 ` [PATCH V4 0/2] mm: FAULT_AROUND_ORDER patchset performance data for powerpc Madhavan Srinivasan
2014-05-15 8:25 ` Madhavan Srinivasan
2014-05-15 17:28 ` Hugh Dickins
2014-05-15 17:28 ` Hugh Dickins
2014-05-19 0:12 ` Rusty Russell
2014-05-19 0:12 ` Rusty Russell
2014-05-19 3:05 ` Madhavan Srinivasan
2014-05-19 3:05 ` Madhavan Srinivasan
2014-05-19 23:23 ` Hugh Dickins
2014-05-19 23:23 ` Hugh Dickins
2014-05-19 23:43 ` Andrew Morton
2014-05-19 23:43 ` Andrew Morton
2014-05-20 0:44 ` Kirill A. Shutemov
2014-05-20 0:44 ` Kirill A. Shutemov
2014-05-20 6:22 ` Rusty Russell
2014-05-20 6:22 ` Rusty Russell
2014-05-20 7:32 ` Andrew Morton
2014-05-20 7:32 ` Andrew Morton
2014-05-20 7:53 ` Madhavan Srinivasan
2014-05-20 10:27 ` Kirill A. Shutemov
2014-05-20 19:59 ` Andrew Morton
2014-05-21 13:40 ` Kirill A. Shutemov
2014-05-21 13:40 ` Kirill A. Shutemov
2014-05-21 20:34 ` Andrew Morton
2014-05-23 12:28 ` Kirill A. Shutemov
2014-05-23 12:28 ` Kirill A. Shutemov
2014-05-27 6:24 ` Madhavan Srinivasan
2014-05-27 6:24 ` Madhavan Srinivasan
2014-05-27 10:21 ` Kirill A. Shutemov
2014-05-27 10:21 ` Kirill A. Shutemov
2014-05-27 10:44 ` Madhavan Srinivasan
2014-05-20 1:14 ` Rusty Russell
2014-05-20 1:14 ` Rusty Russell
2014-05-20 2:34 ` Hugh Dickins [this message]
2014-05-20 2:34 ` Hugh Dickins
2014-05-20 2:06 ` Madhavan Srinivasan
2014-05-20 2:06 ` Madhavan Srinivasan
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