linux-kernel - Re: [PATCH 0/2] pseries/hotplug: Change the default behaviour of cede

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Message-ID: <87impxr0am.fsf@linux.ibm.com>
Date:   Thu, 12 Sep 2019 10:39:45 -0500
From:   Nathan Lynch <nathanl@...ux.ibm.com>
To:     "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
        Kamalesh Babulal <kamaleshb@...ibm.com>,
        "Naveen N . Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Tyrel Datwyler <tyreld@...ux.ibm.com>
Subject: Re: [PATCH 0/2] pseries/hotplug: Change the default behaviour of cede_offline

"Gautham R. Shenoy" <ego@...ux.vnet.ibm.com> writes:
> The patchset also defines a new sysfs attribute
> "/sys/device/system/cpu/cede_offline_enabled" on PSeries Linux guests
> to allow userspace programs to change the state into which the
> offlined CPU need to be put to at runtime.

A boolean sysfs interface will become awkward if we need to add another
mode in the future.

What do you think about naming the attribute something like
'offline_mode', with the possible values 'extended-cede' and
'rtas-stopped'?