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Re: [libc/string] State of PAGE_COPY_FWD / PAGE_COPY_THRESHOLD

From: Florian Weimer <fweimer at redhat dot com>
To: Maxim Kuvyrkov <maxim dot kuvyrkov at linaro dot org>, Adhemerval Zanella <adhemerval dot zanella at linaro dot org>
Cc: libc-alpha at sourceware dot org
Date: Thu, 10 Nov 2016 09:26:37 +0100
Subject: Re: [libc/string] State of PAGE_COPY_FWD / PAGE_COPY_THRESHOLD
Authentication-results: sourceware.org; auth=none
References: <E122D105-776D-4B9B-A15C-0A7C24BC0910@linaro.org> <c05f0be4-6e4b-80cd-ad74-edc16a443b14@linaro.org> <193512EC-DC6C-4BDF-8138-1C1F54B30A12@linaro.org>

On 11/10/2016 08:39 AM, Maxim Kuvyrkov wrote:

A quick investigation shows that there is no such syscall provided by the Linux kernel.  Doesn't mean we can't ask for / implement one.

Linux did exactly this when you read a large block from /dev/zero. Itwas removed because it did not provide any real benefit to applications.It just looked very good in certain benchmarks.


Florian

References:
- [libc/string] State of PAGE_COPY_FWD / PAGE_COPY_THRESHOLD
  - From: Maxim Kuvyrkov
- Re: [libc/string] State of PAGE_COPY_FWD / PAGE_COPY_THRESHOLD
  - From: Adhemerval Zanella
- Re: [libc/string] State of PAGE_COPY_FWD / PAGE_COPY_THRESHOLD
  - From: Maxim Kuvyrkov

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