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Re: [PATCH] arm64: Expose TASK_SIZE to userspace via auxv

From Christopher Covington <cov@codeaurora.org>
Newsgroups linux.kernel
Subject Re: [PATCH] arm64: Expose TASK_SIZE to userspace via auxv
Date 2016-08-17 13:20 +0200
Message-ID <s7733-g9-19@gated-at.bofh.it> (permalink)
References <s6Rrj-6BB-1@gated-at.bofh.it> <s76qm-8dD-41@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On August 17, 2016 6:30:06 AM EDT, Catalin Marinas <catalin.marinas@arm.com> wrote:
>On Tue, Aug 16, 2016 at 02:32:29PM -0400, Christopher Covington wrote:
>> Some userspace applications need to know the maximum virtual address
>they can
>> use (TASK_SIZE).
>
>Just curious, what are the cases needing TASK_SIZE in user space?

Checkpoint/Restore In Userspace and the Mozilla Javascript Engine https://bugzilla.mozilla.org/show_bug.cgi?id=1143022 are the specific cases I've run into. I've heard LuaJIT might have a similar situation. In general I think making allocations from the top down is a shortcut for finding a large unused region of memory.

Thanks,
Cov

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.

Sent from my Snapdragon powered Android device with K-9 Mail. Please excuse my brevity.

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Thread

[PATCH] arm64: Expose TASK_SIZE to userspace via auxv Christopher Covington <cov@codeaurora.org> - 2016-08-16 20:40 +0200
  Re: [PATCH] arm64: Expose TASK_SIZE to userspace via auxv Catalin Marinas <catalin.marinas@arm.com> - 2016-08-17 12:40 +0200
    Re: [PATCH] arm64: Expose TASK_SIZE to userspace via auxv Christopher Covington <cov@codeaurora.org> - 2016-08-17 13:20 +0200
      Re: [PATCH] arm64: Expose TASK_SIZE to userspace via auxv Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-08-18 14:10 +0200
        Re: [PATCH] arm64: Expose TASK_SIZE to userspace via auxv Catalin Marinas <catalin.marinas@arm.com> - 2016-08-18 14:50 +0200
          Re: [PATCH] arm64: Expose TASK_SIZE to userspace via auxv Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-08-18 15:30 +0200
      Re: [PATCH] arm64: Expose TASK_SIZE to userspace via auxv Richard Weinberger <richard.weinberger@gmail.com> - 2016-08-18 14:20 +0200

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