From: Aneesh Kumar K V <aneesh.kumar@linux.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, mpe@ellerman.id.au,
linuxppc-dev@lists.ozlabs.org, npiggin@gmail.com,
christophe.leroy@csgroup.eu, Oscar Salvador <osalvador@suse.de>,
Mike Kravetz <mike.kravetz@oracle.com>,
Dan Williams <dan.j.williams@intel.com>,
Joao Martins <joao.m.martins@oracle.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Muchun Song <muchun.song@linux.dev>,
Will Deacon <will@kernel.org>
Subject: Re: [PATCH v6 00/13] Add support for DAX vmemmap optimization for ppc64
Date: Wed, 26 Jul 2023 10:59:32 +0530 [thread overview]
Message-ID: <47feb4fe-f461-a2c2-1368-5480d00d0f1d@linux.ibm.com> (raw)
In-Reply-To: <20230725122959.e9b79e7528cd3084802fa6d0@linux-foundation.org>
On 7/26/23 12:59 AM, Andrew Morton wrote:
> On Tue, 25 Jul 2023 00:37:46 +0530 "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> wrote:
>
>> This patch series implements changes required to support DAX vmemmap
>> optimization for ppc64.
>
> Do we have any measurements to help us understand the magnitude
> of this optimization?
>
> And any documentation which helps users understand whether and
> why they should enable this feature?
That is memory space optimization due to kernel reusing the tail page struct pages. The details
of the optimization is documented in patch 11. We document there the impact with both 4k and
64K page size.
-aneesh
next prev parent reply other threads:[~2023-07-26 5:29 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-24 19:07 [PATCH v6 00/13] Add support for DAX vmemmap optimization for ppc64 Aneesh Kumar K.V
2023-07-24 19:07 ` [PATCH v6 01/13] mm/hugepage pud: Allow arch-specific helper function to check huge page pud support Aneesh Kumar K.V
2023-07-26 10:52 ` [PATCH v6 01/13 -fix] " Aneesh Kumar K.V
2023-07-24 19:07 ` [PATCH v6 03/13] mm/vmemmap: Improve vmemmap_can_optimize and allow architectures to override Aneesh Kumar K.V
2023-07-24 19:07 ` [PATCH v6 04/13] mm/vmemmap: Allow architectures to override how vmemmap optimization works Aneesh Kumar K.V
2023-07-24 19:07 ` [PATCH v6 05/13] mm: Add pud_same similar to __HAVE_ARCH_P4D_SAME Aneesh Kumar K.V
2023-07-24 19:07 ` [PATCH v6 07/13] mm/vmemmap optimization: Split hugetlb and devdax vmemmap optimization Aneesh Kumar K.V
2023-07-24 19:07 ` [PATCH v6 08/13] powerpc/mm/trace: Convert trace event to trace event class Aneesh Kumar K.V
2023-07-24 19:07 ` [PATCH v6 09/13] powerpc/book3s64/mm: Enable transparent pud hugepage Aneesh Kumar K.V
2023-07-24 19:07 ` [PATCH v6 10/13] powerpc/book3s64/vmemmap: Switch radix to use a different vmemmap handling function Aneesh Kumar K.V
2023-07-27 5:06 ` [PATCH v6 10/13 -fix] " Aneesh Kumar K.V
2023-07-28 10:22 ` [PATCH v6 10/13 -fix2] " Aneesh Kumar K.V
2023-07-24 19:07 ` [PATCH v6 11/13] powerpc/book3s64/radix: Add support for vmemmap optimization for radix Aneesh Kumar K.V
2023-07-26 14:05 ` [PATCH v6 11/13 -fix] " Aneesh Kumar K.V
2023-07-24 19:07 ` [PATCH v6 13/13] powerpc/book3s64/radix: Add debug message to give more details of vmemmap allocation Aneesh Kumar K.V
2023-07-25 19:29 ` [PATCH v6 00/13] Add support for DAX vmemmap optimization for ppc64 Andrew Morton
2023-07-26 5:29 ` Aneesh Kumar K V [this message]
2023-07-26 18:52 ` Andrew Morton
2023-07-27 5:37 ` Aneesh Kumar K.V
[not found] ` <20230724190759.483013-13-aneesh.kumar@linux.ibm.com>
2023-07-28 10:23 ` [PATCH v6 12/13 -fix] powerpc/book3s64/radix: Remove mmu_vmemmap_psize Aneesh Kumar K.V
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=47feb4fe-f461-a2c2-1368-5480d00d0f1d@linux.ibm.com \
--to=aneesh.kumar@linux.ibm.com \
--cc=akpm@linux-foundation.org \
--cc=catalin.marinas@arm.com \
--cc=christophe.leroy@csgroup.eu \
--cc=dan.j.williams@intel.com \
--cc=joao.m.martins@oracle.com \
--cc=linux-mm@kvack.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mike.kravetz@oracle.com \
--cc=mpe@ellerman.id.au \
--cc=muchun.song@linux.dev \
--cc=npiggin@gmail.com \
--cc=osalvador@suse.de \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).