linux-kernel - Re: [PATCH V9 1/4] perf/core: Add PERF_SAMPLE_DATA_PAGE

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Message-ID: <20201112140135.GZ17076@casper.infradead.org>
Date:   Thu, 12 Nov 2020 14:01:35 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     "Liang, Kan" <kan.liang@...ux.intel.com>,
        Will Deacon <will@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>, mingo@...hat.com,
        acme@...nel.org, linux-kernel@...r.kernel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, eranian@...gle.com, ak@...ux.intel.com,
        dave.hansen@...el.com, kirill.shutemov@...ux.intel.com,
        benh@...nel.crashing.org, paulus@...ba.org,
        David Miller <davem@...emloft.net>, vbabka@...e.cz
Subject: Re: [PATCH V9 1/4] perf/core: Add PERF_SAMPLE_DATA_PAGE_SIZE

On Thu, Nov 12, 2020 at 12:36:45PM +0100, Peter Zijlstra wrote:
> On Thu, Nov 12, 2020 at 10:53:58AM +0100, Peter Zijlstra wrote:
> > You just don't like it because you want me to be purely page-table
> > based.
> 
> How's something like this then? I failed to untangle Power's many MMUs
> though :/

Looks good to me.  Might want to rename

> -__weak u64 arch_perf_get_page_size(struct mm_struct *mm, unsigned long addr)
> +static u64 arch_perf_get_page_size(struct mm_struct *mm, unsigned long addr)

to perf_get_tlb_entry_size() or some such.