From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Peter Zijlstra <peterz@infradead.org>
Cc: mark.rutland@arm.com, alexander.shishkin@linux.intel.com,
catalin.marinas@arm.com, eranian@google.com,
dave.hansen@intel.com, sparclinux@vger.kernel.org,
will@kernel.org, mingo@kernel.org, kan.liang@linux.intel.com,
linux-arch@vger.kernel.org, ak@linux.intel.com,
aneesh.kumar@linux.ibm.com, willy@infradead.org,
jolsa@redhat.com, npiggin@gmail.com, acme@kernel.org,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
davem@davemloft.net, kirill.shutemov@linux.intel.com
Subject: Re: [PATCH 0/5] perf/mm: Fix PERF_SAMPLE_*_PAGE_SIZE
Date: Mon, 16 Nov 2020 18:43:57 +0300 [thread overview]
Message-ID: <20201116154357.bw64c5ie2kiu5l4x@box> (raw)
In-Reply-To: <20201113111901.743573013@infradead.org>
On Fri, Nov 13, 2020 at 12:19:01PM +0100, Peter Zijlstra wrote:
> Hi,
>
> These patches provide generic infrastructure to determine TLB page size from
> page table entries alone. Perf will use this (for either data or code address)
> to aid in profiling TLB issues.
I'm not sure it's an issue, but strictly speaking, size of page according
to page table tree doesn't mean pagewalk would fill TLB entry of the size.
CPU may support 1G pages in page table tree without 1G TLB at all.
IIRC, current Intel CPU still don't have any 1G iTLB entries and fill 2M
iTLB instead.
--
Kirill A. Shutemov
next prev parent reply other threads:[~2020-11-16 15:46 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-13 11:19 [PATCH 0/5] perf/mm: Fix PERF_SAMPLE_*_PAGE_SIZE Peter Zijlstra
2020-11-13 11:19 ` [PATCH 1/5] mm/gup: Provide gup_get_pte() more generic Peter Zijlstra
2020-11-13 11:19 ` [PATCH 2/5] mm: Introduce pXX_leaf_size() Peter Zijlstra
2020-11-13 11:45 ` Peter Zijlstra
2020-11-13 11:19 ` [PATCH 3/5] perf/core: Fix arch_perf_get_page_size() Peter Zijlstra
2020-11-16 13:11 ` Liang, Kan
2020-11-13 11:19 ` [PATCH 4/5] arm64/mm: Implement pXX_leaf_size() support Peter Zijlstra
2020-11-13 11:19 ` [PATCH 5/5] sparc64/mm: " Peter Zijlstra
2020-11-13 13:44 ` [PATCH 0/5] perf/mm: Fix PERF_SAMPLE_*_PAGE_SIZE Christophe Leroy
2020-11-20 11:18 ` Christophe Leroy
2020-11-20 12:20 ` Peter Zijlstra
2020-11-26 10:46 ` Peter Zijlstra
2020-11-16 15:43 ` Kirill A. Shutemov [this message]
2020-11-16 15:54 ` Matthew Wilcox
2020-11-16 16:28 ` Dave Hansen
2020-11-16 16:32 ` Matthew Wilcox
2020-11-16 16:36 ` Dave Hansen
2020-11-16 16:57 ` Peter Zijlstra
2020-11-16 16:55 ` Peter Zijlstra
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