From: Steven Price <steven.price@arm.com> To: Dave Hansen <dave.hansen@intel.com>, linux-mm@kvack.org Cc: x86@kernel.org, "Arnd Bergmann" <arnd@arndb.de>, "Ard Biesheuvel" <ard.biesheuvel@linaro.org>, "Peter Zijlstra" <peterz@infradead.org>, "Catalin Marinas" <catalin.marinas@arm.com>, "Dave Hansen" <dave.hansen@linux.intel.com>, "Will Deacon" <will.deacon@arm.com>, linux-kernel@vger.kernel.org, "Jérôme Glisse" <jglisse@redhat.com>, "Ingo Molnar" <mingo@redhat.com>, "Borislav Petkov" <bp@alien8.de>, "Andy Lutomirski" <luto@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>, "James Morse" <james.morse@arm.com>, "Thomas Gleixner" <tglx@linutronix.de>, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 13/13] x86: mm: Convert dump_pagetables to use walk_page_range Date: Fri, 15 Feb 2019 17:32:32 +0000 [thread overview] Message-ID: <9d7d1e1f-93de-c9a8-e6bb-63696e162210@arm.com> (raw) In-Reply-To: <59a6d402-e383-b9d0-499a-7d65b9a2d402@intel.com> On 15/02/2019 17:16, Dave Hansen wrote: > On 2/15/19 9:02 AM, Steven Price wrote: >> arch/x86/mm/dump_pagetables.c | 281 ++++++++++++++++++---------------- >> 1 file changed, 146 insertions(+), 135 deletions(-) > > I'll look through this in more detail in a bit. But, I'm a bit bummed > out by the diffstat. When I see patches add a bunch of infrastructure, > I *really* hope for code simplification. > > Looking at the diff, I think it gets there. The code you add is > simpler than the code you remove. But, the diffstat is misleading. I agree, I was disappointed myself by the diffstat. Hopefully the code is simplier though - there's unfortunately quite a bit of boiler plate code in the new version, but that code is at least easier to understand. My hope is that it will be possible to move the boiler plate code into common code (there's a lot of similarity with arm64 here). However I wanted to get some agreement on the approach and make a non-functional change before attempting to unify the different dump_pagetables implementations (which is likely to cause minor functional changes). > I'd probably address this disparity for each patch in the changelogs. Good point, I'll try to remember for next time. Thanks for taking a look, Steve
WARNING: multiple messages have this Message-ID (diff)
From: Steven Price <steven.price@arm.com> To: Dave Hansen <dave.hansen@intel.com>, linux-mm@kvack.org Cc: "Dave Hansen" <dave.hansen@linux.intel.com>, "Arnd Bergmann" <arnd@arndb.de>, "Ard Biesheuvel" <ard.biesheuvel@linaro.org>, "Peter Zijlstra" <peterz@infradead.org>, "Catalin Marinas" <catalin.marinas@arm.com>, x86@kernel.org, "Will Deacon" <will.deacon@arm.com>, linux-kernel@vger.kernel.org, "Jérôme Glisse" <jglisse@redhat.com>, "Ingo Molnar" <mingo@redhat.com>, "Borislav Petkov" <bp@alien8.de>, "Andy Lutomirski" <luto@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>, "James Morse" <james.morse@arm.com>, "Thomas Gleixner" <tglx@linutronix.de>, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 13/13] x86: mm: Convert dump_pagetables to use walk_page_range Date: Fri, 15 Feb 2019 17:32:32 +0000 [thread overview] Message-ID: <9d7d1e1f-93de-c9a8-e6bb-63696e162210@arm.com> (raw) In-Reply-To: <59a6d402-e383-b9d0-499a-7d65b9a2d402@intel.com> On 15/02/2019 17:16, Dave Hansen wrote: > On 2/15/19 9:02 AM, Steven Price wrote: >> arch/x86/mm/dump_pagetables.c | 281 ++++++++++++++++++---------------- >> 1 file changed, 146 insertions(+), 135 deletions(-) > > I'll look through this in more detail in a bit. But, I'm a bit bummed > out by the diffstat. When I see patches add a bunch of infrastructure, > I *really* hope for code simplification. > > Looking at the diff, I think it gets there. The code you add is > simpler than the code you remove. But, the diffstat is misleading. I agree, I was disappointed myself by the diffstat. Hopefully the code is simplier though - there's unfortunately quite a bit of boiler plate code in the new version, but that code is at least easier to understand. My hope is that it will be possible to move the boiler plate code into common code (there's a lot of similarity with arm64 here). However I wanted to get some agreement on the approach and make a non-functional change before attempting to unify the different dump_pagetables implementations (which is likely to cause minor functional changes). > I'd probably address this disparity for each patch in the changelogs. Good point, I'll try to remember for next time. Thanks for taking a look, Steve _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-02-15 17:32 UTC|newest] Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-02-15 17:02 [PATCH 00/13] Convert x86 & arm64 to use generic page walk Steven Price 2019-02-15 17:02 ` Steven Price 2019-02-15 17:02 ` [PATCH 01/13] arm64: mm: Add p?d_large() definitions Steven Price 2019-02-15 17:02 ` Steven Price 2019-02-18 11:16 ` Mark Rutland 2019-02-18 11:16 ` Mark Rutland 2019-02-18 11:29 ` Peter Zijlstra 2019-02-18 11:29 ` Peter Zijlstra 2019-02-18 13:45 ` Mark Rutland 2019-02-18 13:45 ` Mark Rutland 2019-02-18 14:11 ` Steven Price 2019-02-18 14:11 ` Steven Price 2019-02-18 14:29 ` Mark Rutland 2019-02-18 14:29 ` Mark Rutland 2019-02-18 15:06 ` Peter Zijlstra 2019-02-18 15:06 ` Peter Zijlstra 2019-02-18 15:30 ` Steven Price 2019-02-18 15:30 ` Steven Price 2019-02-18 17:04 ` Mark Rutland 2019-02-18 17:04 ` Mark Rutland 2019-02-18 17:22 ` Steven Price 2019-02-18 17:22 ` Steven Price 2019-02-15 17:02 ` [PATCH 02/13] x86/mm: " Steven Price 2019-02-15 17:02 ` Steven Price 2019-02-15 17:02 ` [PATCH 03/13] mm: Add generic p?d_large() macros Steven Price 2019-02-15 17:02 ` Steven Price 2019-02-18 11:14 ` Mark Rutland 2019-02-18 11:14 ` Mark Rutland 2019-02-18 12:53 ` Peter Zijlstra 2019-02-18 12:53 ` Peter Zijlstra 2019-02-18 14:20 ` Steven Price 2019-02-18 14:20 ` Steven Price 2019-02-18 11:31 ` Peter Zijlstra 2019-02-18 11:31 ` Peter Zijlstra 2019-02-18 14:19 ` Steven Price 2019-02-18 14:19 ` Steven Price 2019-02-19 3:44 ` Liang, Kan 2019-02-19 3:44 ` Liang, Kan 2019-02-20 13:56 ` Steven Price 2019-02-20 13:56 ` Steven Price 2019-02-15 17:02 ` [PATCH 04/13] mm: pagewalk: Add p4d_entry() and pgd_entry() Steven Price 2019-02-15 17:02 ` Steven Price 2019-02-15 17:02 ` [PATCH 05/13] mm: pagewalk: Allow walking without vma Steven Price 2019-02-15 17:02 ` Steven Price 2019-02-15 17:02 ` [PATCH 06/13] mm: pagewalk: Add 'depth' parameter to pte_hole Steven Price 2019-02-15 17:02 ` Steven Price 2019-02-18 11:23 ` Mark Rutland 2019-02-18 11:23 ` Mark Rutland 2019-02-18 15:23 ` Steven Price 2019-02-18 15:23 ` Steven Price 2019-02-20 11:35 ` William Kucharski 2019-02-20 11:35 ` William Kucharski 2019-02-20 14:10 ` Steven Price 2019-02-20 14:10 ` Steven Price 2019-02-15 17:02 ` [PATCH 07/13] mm: pagewalk: Add test_p?d callbacks Steven Price 2019-02-15 17:02 ` Steven Price 2019-02-15 17:02 ` [PATCH 08/13] arm64: mm: Convert mm/dump.c to use walk_page_range() Steven Price 2019-02-15 17:02 ` Steven Price 2019-02-15 17:02 ` [PATCH 09/13] x86/mm: Point to struct seq_file from struct pg_state Steven Price 2019-02-15 17:02 ` Steven Price 2019-02-15 17:02 ` [PATCH 10/13] x86/mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct Steven Price 2019-02-15 17:02 ` Steven Price 2019-02-15 17:02 ` [PATCH 11/13] x86/mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct Steven Price 2019-02-15 17:02 ` Steven Price 2019-02-15 17:02 ` [PATCH 12/13] x86/mm: Convert ptdump_walk_pgd_level_core() " Steven Price 2019-02-15 17:02 ` Steven Price 2019-02-15 17:02 ` [PATCH 13/13] x86: mm: Convert dump_pagetables to use walk_page_range Steven Price 2019-02-15 17:02 ` Steven Price 2019-02-15 17:16 ` Dave Hansen 2019-02-15 17:16 ` Dave Hansen 2019-02-15 17:32 ` Steven Price [this message] 2019-02-15 17:32 ` Steven Price
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