Re: [RFC 0/6] x86: prefetch_page() vDSO call
From: Nadav Amit
Date: Thu Feb 25 2021 - 04:37:24 EST
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On Feb 25, 2021, at 12:52 AM, Nadav Amit <nadav.amit@xxxxxxxxx> wrote:
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> On Feb 25, 2021, at 12:40 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
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> On Wed, Feb 24, 2021 at 11:29:04PM -0800, Nadav Amit wrote:
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>> From: Nadav Amit <namit@xxxxxxxxxx>
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>> Just as applications can use prefetch instructions to overlap
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>> computations and memory accesses, applications may want to overlap the
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>> page-faults and compute or overlap the I/O accesses that are required
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>> for page-faults of different pages.
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[ snip ]
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> Interesting, but given we've been removing explicit prefetch from some
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> parts of the kernel how useful is this in actual use? I'm thinking there
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> should at least be a real user and performance numbers with this before
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> merging.
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Can you give me a reference to the “removing explicit prefetch from some
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parts of the kernel”?
Oh. I get it - you mean we remove we remove the use of explicit memory
prefetch from the kernel code. Well, I don’t think it is really related,
but yes, performance numbers are needed.
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