From: Dave Hansen <dave.hansen@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: will.deacon@arm.com, aneesh.kumar@linux.vnet.ibm.com,
akpm@linux-foundation.org, npiggin@gmail.com,
linux-arch@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, linux@armlinux.org.uk,
heiko.carstens@de.ibm.com
Subject: Re: [RFC][PATCH 03/11] x86/mm: Page size aware flush_tlb_mm_range()
Date: Thu, 13 Sep 2018 11:47:59 -0700 [thread overview]
Message-ID: <559a0a91-d8d1-453c-6071-1a6ce891c66f@linux.intel.com> (raw)
In-Reply-To: <20180913184230.GD24124@hirez.programming.kicks-ass.net>
>>> --- a/arch/x86/include/asm/tlbflush.h
>>> +++ b/arch/x86/include/asm/tlbflush.h
>>> @@ -507,23 +507,25 @@ struct flush_tlb_info {
>>> unsigned long start;
>>> unsigned long end;
>>> u64 new_tlb_gen;
>>> + unsigned int invl_shift;
>>> };
>>
>> Maybe we really should just call this flush_stride or something.
>
> But its a shift, not a size. stride_shift?
Yeah, sounds better than 'invl' to me.
>>> #define local_flush_tlb() __flush_tlb()
>>>
>>> #define flush_tlb_mm(mm) flush_tlb_mm_range(mm, 0UL, TLB_FLUSH_ALL, 0UL)
>>>
>>> -#define flush_tlb_range(vma, start, end) \
>>> - flush_tlb_mm_range(vma->vm_mm, start, end, vma->vm_flags)
>>> +#define flush_tlb_range(vma, start, end) \
>>> + flush_tlb_mm_range((vma)->vm_mm, start, end, \
>>> + (vma)->vm_flags & VM_HUGETLB ? PMD_SHIFT : PAGE_SHIFT)
>>
>> This is safe. But, Couldn't this PMD_SHIFT also be PUD_SHIFT for a 1G
>> hugetlb page?
>
> It could be, but can we tell at that point?
We should have the page size via huge_page_shift(hstate_vma(vma)). No
idea if it'll work in practice, though.
next prev parent reply other threads:[~2018-09-13 18:48 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-13 9:21 [RFC][PATCH 00/11] my generic mmu_gather patches Peter Zijlstra
2018-09-13 9:21 ` [RFC][PATCH 01/11] asm-generic/tlb: Provide a comment Peter Zijlstra
2018-09-13 10:30 ` Martin Schwidefsky
2018-09-13 10:57 ` Peter Zijlstra
2018-09-13 12:18 ` Martin Schwidefsky
2018-09-13 12:39 ` Peter Zijlstra
2018-09-14 10:28 ` Martin Schwidefsky
2018-09-14 13:02 ` Peter Zijlstra
2018-09-14 14:07 ` Martin Schwidefsky
2018-09-14 16:48 ` Will Deacon
2018-09-19 11:33 ` Peter Zijlstra
2018-09-19 11:51 ` Peter Zijlstra
2018-09-19 12:23 ` Will Deacon
2018-09-19 13:12 ` Peter Zijlstra
2018-09-13 9:21 ` [RFC][PATCH 02/11] asm-generic/tlb: Provide HAVE_MMU_GATHER_PAGE_SIZE Peter Zijlstra
2018-09-14 16:56 ` Will Deacon
2018-09-13 9:21 ` [RFC][PATCH 03/11] x86/mm: Page size aware flush_tlb_mm_range() Peter Zijlstra
2018-09-13 17:22 ` Dave Hansen
2018-09-13 18:42 ` Peter Zijlstra
2018-09-13 18:46 ` Peter Zijlstra
2018-09-13 18:48 ` Peter Zijlstra
2018-09-13 18:49 ` Dave Hansen
2018-09-13 18:47 ` Dave Hansen [this message]
2018-09-13 9:21 ` [RFC][PATCH 04/11] asm-generic/tlb: Provide generic VIPT cache flush Peter Zijlstra
2018-09-14 16:56 ` Will Deacon
2018-09-13 9:21 ` [RFC][PATCH 05/11] asm-generic/tlb: Provide generic tlb_flush Peter Zijlstra
2018-09-13 13:09 ` Jann Horn
2018-09-13 14:06 ` Peter Zijlstra
2018-09-13 9:21 ` [RFC][PATCH 06/11] asm-generic/tlb: Conditionally provide tlb_migrate_finish() Peter Zijlstra
2018-09-14 16:57 ` Will Deacon
2018-09-13 9:21 ` [RFC][PATCH 07/11] arm/tlb: Convert to generic mmu_gather Peter Zijlstra
2018-09-18 14:10 ` Will Deacon
2018-09-19 11:28 ` Peter Zijlstra
2018-09-19 12:24 ` Will Deacon
2018-09-19 11:30 ` Peter Zijlstra
2018-09-13 9:21 ` [RFC][PATCH 08/11] ia64/tlb: Conver " Peter Zijlstra
2018-09-13 9:21 ` [RFC][PATCH 09/11] sh/tlb: Convert SH " Peter Zijlstra
2018-09-13 9:21 ` [RFC][PATCH 10/11] um/tlb: Convert " Peter Zijlstra
2018-09-13 9:21 ` [RFC][PATCH 11/11] arch/tlb: Clean up simple architectures Peter Zijlstra
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