From: Andrew Morton <akpm@linux-foundation.org>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: linux-mm@kvack.org, mpe@ellerman.id.au,
linuxppc-dev@lists.ozlabs.org, kaleshsingh@google.com,
npiggin@gmail.com, joel@joelfernandes.org,
Christophe Leroy <christophe.leroy@csgroup.eu>
Subject: Re: [PATCH v5 9/9] powerpc/mm: Enable move pmd/pud
Date: Tue, 11 May 2021 15:19:49 -0700 [thread overview]
Message-ID: <20210511151949.fa1973124f3aba1ea7abceb9@linux-foundation.org> (raw)
In-Reply-To: <20210422054323.150993-10-aneesh.kumar@linux.ibm.com>
On Thu, 22 Apr 2021 11:13:23 +0530 "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> wrote:
> mremap HAVE_MOVE_PMD/PUD optimization time comparison for 1GB region:
> 1GB mremap - Source PTE-aligned, Destination PTE-aligned
> mremap time: 1127034ns
> 1GB mremap - Source PMD-aligned, Destination PMD-aligned
> mremap time: 508817ns
> 1GB mremap - Source PUD-aligned, Destination PUD-aligned
> mremap time: 23046ns
Well that's nice.
How significant is this in practice? How common is it for applications
to successfully align the region? Do real-world applications actually
benefit from this?
Are there userspace libraries (malloc() etc) which should be reworked
to fully exploit this?
WARNING: multiple messages have this Message-ID (diff)
From: Andrew Morton <akpm@linux-foundation.org>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: npiggin@gmail.com, linux-mm@kvack.org, kaleshsingh@google.com,
joel@joelfernandes.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v5 9/9] powerpc/mm: Enable move pmd/pud
Date: Tue, 11 May 2021 15:19:49 -0700 [thread overview]
Message-ID: <20210511151949.fa1973124f3aba1ea7abceb9@linux-foundation.org> (raw)
In-Reply-To: <20210422054323.150993-10-aneesh.kumar@linux.ibm.com>
On Thu, 22 Apr 2021 11:13:23 +0530 "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> wrote:
> mremap HAVE_MOVE_PMD/PUD optimization time comparison for 1GB region:
> 1GB mremap - Source PTE-aligned, Destination PTE-aligned
> mremap time: 1127034ns
> 1GB mremap - Source PMD-aligned, Destination PMD-aligned
> mremap time: 508817ns
> 1GB mremap - Source PUD-aligned, Destination PUD-aligned
> mremap time: 23046ns
Well that's nice.
How significant is this in practice? How common is it for applications
to successfully align the region? Do real-world applications actually
benefit from this?
Are there userspace libraries (malloc() etc) which should be reworked
to fully exploit this?
next prev parent reply other threads:[~2021-05-11 22:19 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-22 5:43 [PATCH v5 0/9] Speedup mremap on ppc64 Aneesh Kumar K.V
2021-04-22 5:43 ` Aneesh Kumar K.V
2021-04-22 5:43 ` [PATCH v5 1/9] selftest/mremap_test: Update the test to handle pagesize other than 4K Aneesh Kumar K.V
2021-04-22 5:43 ` Aneesh Kumar K.V
2021-04-22 5:43 ` [PATCH v5 2/9] selftest/mremap_test: Avoid crash with static build Aneesh Kumar K.V
2021-04-22 5:43 ` Aneesh Kumar K.V
2021-04-22 5:43 ` [PATCH v5 3/9] mm/mremap: Use pmd/pud_poplulate to update page table entries Aneesh Kumar K.V
2021-04-22 5:43 ` Aneesh Kumar K.V
2021-05-18 20:04 ` Nathan Chancellor
2021-05-18 20:04 ` Nathan Chancellor
2021-05-19 4:46 ` Aneesh Kumar K.V
2021-05-19 4:46 ` Aneesh Kumar K.V
2021-05-19 18:02 ` Nathan Chancellor
2021-05-19 18:02 ` Nathan Chancellor
2021-05-20 2:18 ` Peter Xu
2021-05-20 2:18 ` Peter Xu
2021-05-20 8:26 ` Aneesh Kumar K.V
2021-05-20 8:26 ` Aneesh Kumar K.V
2021-05-20 12:46 ` Peter Xu
2021-05-20 12:46 ` Peter Xu
2021-05-20 13:23 ` Aneesh Kumar K.V
2021-05-20 13:23 ` Aneesh Kumar K.V
2021-05-20 13:37 ` Aneesh Kumar K.V
2021-05-20 13:37 ` Aneesh Kumar K.V
2021-05-20 14:57 ` Peter Xu
2021-05-20 14:57 ` Peter Xu
2021-05-20 19:06 ` Zi Yan
2021-05-20 19:06 ` Zi Yan
2021-05-20 20:01 ` Peter Xu
2021-05-20 20:01 ` Peter Xu
2021-05-20 20:25 ` Kalesh Singh
2021-05-20 20:25 ` Kalesh Singh
2021-04-22 5:43 ` [PATCH v5 4/9] powerpc/mm/book3s64: Fix possible build error Aneesh Kumar K.V
2021-04-22 5:43 ` Aneesh Kumar K.V
2021-04-22 5:43 ` [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument Aneesh Kumar K.V
2021-04-22 5:43 ` Aneesh Kumar K.V
2021-05-15 16:35 ` Guenter Roeck
2021-05-15 16:35 ` Guenter Roeck
2021-05-15 20:41 ` Andrew Morton
2021-05-15 20:41 ` Andrew Morton
2021-05-15 23:05 ` Guenter Roeck
2021-05-15 23:05 ` Guenter Roeck
2021-05-17 8:40 ` Aneesh Kumar K.V
2021-05-17 8:40 ` Aneesh Kumar K.V
2021-05-17 13:38 ` Guenter Roeck
2021-05-17 13:38 ` Guenter Roeck
2021-05-17 13:55 ` Aneesh Kumar K.V
2021-05-17 13:55 ` Aneesh Kumar K.V
2021-05-17 14:18 ` Guenter Roeck
2021-05-17 14:18 ` Guenter Roeck
2021-05-19 0:26 ` Michael Ellerman
2021-05-19 0:26 ` Michael Ellerman
2021-05-19 0:45 ` Segher Boessenkool
2021-05-19 0:45 ` Segher Boessenkool
2021-05-19 12:03 ` Segher Boessenkool
2021-05-19 13:37 ` Guenter Roeck
2021-05-19 14:20 ` Segher Boessenkool
2021-05-19 14:20 ` Segher Boessenkool
2021-05-19 15:28 ` Guenter Roeck
2021-05-19 15:28 ` Guenter Roeck
2021-05-20 7:37 ` Michael Ellerman
2021-05-20 12:17 ` Segher Boessenkool
2021-05-19 1:08 ` Guenter Roeck
2021-05-19 1:08 ` Guenter Roeck
2021-05-20 11:38 ` Michael Ellerman
2021-05-20 11:38 ` Michael Ellerman
2021-05-20 11:56 ` Guenter Roeck
2021-05-20 11:56 ` Guenter Roeck
2021-04-22 5:43 ` [PATCH v5 6/9] mm/mremap: Use range flush that does TLB and page walk cache flush Aneesh Kumar K.V
2021-04-22 5:43 ` Aneesh Kumar K.V
2021-04-22 5:43 ` [PATCH v5 7/9] mm/mremap: Move TLB flush outside page table lock Aneesh Kumar K.V
2021-04-22 5:43 ` Aneesh Kumar K.V
2021-05-20 15:26 ` Aneesh Kumar K.V
2021-05-20 15:26 ` Aneesh Kumar K.V
2021-05-20 16:57 ` Aneesh Kumar K.V
2021-05-20 16:57 ` Aneesh Kumar K.V
2021-05-21 2:40 ` Linus Torvalds
2021-05-21 2:40 ` Linus Torvalds
2021-05-21 3:03 ` Aneesh Kumar K.V
2021-05-21 3:03 ` Aneesh Kumar K.V
2021-05-21 3:28 ` Aneesh Kumar K.V
2021-05-21 3:28 ` Aneesh Kumar K.V
2021-05-21 6:13 ` Linus Torvalds
2021-05-21 6:13 ` Linus Torvalds
2021-05-21 12:50 ` Aneesh Kumar K.V
2021-05-21 12:50 ` Aneesh Kumar K.V
2021-05-21 13:03 ` Aneesh Kumar K.V
2021-05-21 13:03 ` Aneesh Kumar K.V
2021-05-21 16:03 ` Linus Torvalds
2021-05-21 16:03 ` Linus Torvalds
2021-05-21 16:29 ` Aneesh Kumar K.V
2021-05-21 16:29 ` Aneesh Kumar K.V
2021-05-24 14:24 ` Aneesh Kumar K.V
2021-05-24 14:24 ` Aneesh Kumar K.V
2021-05-21 15:24 ` Liam Howlett
2021-05-21 15:24 ` Liam Howlett
2021-05-21 16:02 ` Aneesh Kumar K.V
2021-05-21 16:02 ` Aneesh Kumar K.V
2021-05-21 16:05 ` Linus Torvalds
2021-05-21 16:05 ` Linus Torvalds
2021-04-22 5:43 ` [PATCH v5 8/9] mm/mremap: Allow arch runtime override Aneesh Kumar K.V
2021-04-22 5:43 ` Aneesh Kumar K.V
2021-04-22 5:43 ` [PATCH v5 9/9] powerpc/mm: Enable move pmd/pud Aneesh Kumar K.V
2021-04-22 5:43 ` Aneesh Kumar K.V
2021-05-11 22:19 ` Andrew Morton [this message]
2021-05-11 22:19 ` Andrew Morton
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