From: Florian Weimer via Libc-alpha <libc-alpha@sourceware.org>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: Siddhesh Poyarekar <siddhesh@sourceware.org>,
"H.J. Lu via Libc-alpha" <libc-alpha@sourceware.org>
Subject: Re: [PATCH 2/4] Set tunable value as well as min/max values
Date: Mon, 28 Sep 2020 16:03:24 +0200 [thread overview]
Message-ID: <87zh5a5783.fsf@oldenburg2.str.redhat.com> (raw)
In-Reply-To: <CAMe9rOqFei2Lbf07jgdHLe1f=12XbdcOv84hAX1B=ssnynOXVg@mail.gmail.com> (H. J. Lu's message of "Mon, 28 Sep 2020 06:53:09 -0700")
* H. J. Lu:
> On Mon, Sep 28, 2020 at 6:35 AM Florian Weimer <fweimer@redhat.com> wrote:
>>
>> * H. J. Lu via Libc-alpha:
>>
>> > Some tunable values and their minimum/maximum values must be determinted
>> > at run-time. Add TUNABLE_SET_ALL and TUNABLE_SET_ALL_FULL to update
>> > tunable value together with minimum and maximum values. __tunable_set_val
>> > is updated to set tunable value as well as min/max values.
>>
>> I'm not sure if this change is philosophically correct as far as the
>> tunables framework is concerned. I had thought the limits should be
>> something static, so that they are consistent across systems.
>
> Some x86 tunables ranges are dynamic.
>
>> Maybe Siddhesh can comment on that aspect?
>>
>> What is supposed to happen if you specify an out-of-range value?
>
> It should be rejected. Otherwise programs will crash.
You could still do this outside the tunables framework, I think.
Let's wait for Siddhesh's comments.
Thanks,
Florian
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next prev parent reply other threads:[~2020-09-28 14:03 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-18 16:07 V2 [PATCH 0/4] ld.so: Add --list-tunables to print tunable values H.J. Lu via Libc-alpha
2020-09-18 16:07 ` [PATCH 1/4] x86: Initialize CPU info via IFUNC relocation [BZ 26203] H.J. Lu via Libc-alpha
2020-09-28 13:08 ` Florian Weimer via Libc-alpha
2020-09-28 13:48 ` H.J. Lu via Libc-alpha
2020-09-28 14:05 ` Florian Weimer via Libc-alpha
2020-09-28 14:20 ` H.J. Lu via Libc-alpha
2020-09-28 14:22 ` Florian Weimer via Libc-alpha
2020-09-28 14:39 ` H.J. Lu via Libc-alpha
2020-09-28 14:47 ` Florian Weimer via Libc-alpha
2020-09-28 17:54 ` V3 [PATCH] " H.J. Lu via Libc-alpha
2020-09-29 7:53 ` Florian Weimer via Libc-alpha
2020-09-29 11:44 ` H.J. Lu via Libc-alpha
2020-10-01 8:46 ` Florian Weimer via Libc-alpha
2020-10-01 19:50 ` V4 " H.J. Lu via Libc-alpha
2020-10-08 13:22 ` PING: " H.J. Lu via Libc-alpha
2020-10-15 12:53 ` PING^2: " H.J. Lu via Libc-alpha
2022-05-02 13:59 ` Sunil Pandey via Libc-alpha
2022-05-03 18:51 ` Sunil Pandey via Libc-alpha
2020-09-18 16:07 ` [PATCH 2/4] Set tunable value as well as min/max values H.J. Lu via Libc-alpha
2020-09-28 13:35 ` Florian Weimer via Libc-alpha
2020-09-28 13:53 ` H.J. Lu via Libc-alpha
2020-09-28 14:03 ` Florian Weimer via Libc-alpha [this message]
2020-09-28 17:30 ` Siddhesh Poyarekar via Libc-alpha
2020-09-29 4:00 ` V3 [PATCH] " H.J. Lu via Libc-alpha
2020-09-29 4:45 ` Siddhesh Poyarekar via Libc-alpha
2020-09-29 4:47 ` Siddhesh Poyarekar
2020-09-29 12:30 ` V4 " H.J. Lu via Libc-alpha
2020-09-29 13:50 ` Siddhesh Poyarekar via Libc-alpha
2020-09-29 14:54 ` V5 " H.J. Lu via Libc-alpha
2020-09-29 15:58 ` Siddhesh Poyarekar via Libc-alpha
2020-09-18 16:07 ` [PATCH 3/4] x86: Move x86 processor cache info to cpu_features H.J. Lu via Libc-alpha
2020-09-18 16:07 ` [PATCH 4/4] ld.so: Add --list-tunables to print tunable values H.J. Lu via Libc-alpha
2020-09-21 8:25 ` Florian Weimer via Libc-alpha
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