linux-kernel - Re: [RFC PATCH v5 01/16] slub: Add isolate() and migrate() methods

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Message-ID: <20190521003709.GA21811@tower.DHCP.thefacebook.com>
Date:   Tue, 21 May 2019 00:37:16 +0000
From:   Roman Gushchin <guro@...com>
To:     "Tobin C. Harding" <tobin@...nel.org>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Alexander Viro <viro@....linux.org.uk>,
        "Christoph Hellwig" <hch@...radead.org>,
        Pekka Enberg <penberg@...helsinki.fi>,
        "David Rientjes" <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Christopher Lameter <cl@...ux.com>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Andreas Dilger <adilger@...ger.ca>,
        Waiman Long <longman@...hat.com>,
        "Tycho Andersen" <tycho@...ho.ws>, Theodore Ts'o <tytso@....edu>,
        Andi Kleen <ak@...ux.intel.com>,
        David Chinner <david@...morbit.com>,
        Nick Piggin <npiggin@...il.com>,
        Rik van Riel <riel@...hat.com>,
        Hugh Dickins <hughd@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v5 01/16] slub: Add isolate() and migrate() methods

On Mon, May 20, 2019 at 03:40:02PM +1000, Tobin C. Harding wrote:
> Add the two methods needed for moving objects and enable the display of
> the callbacks via the /sys/kernel/slab interface.
> 
> Add documentation explaining the use of these methods and the prototypes
> for slab.h. Add functions to setup the callbacks method for a slab
> cache.
> 
> Add empty functions for SLAB/SLOB. The API is generic so it could be
> theoretically implemented for these allocators as well.
> 
> Change sysfs 'ctor' field to be 'ops' to contain all the callback
> operations defined for a slab cache.  Display the existing 'ctor'
> callback in the ops fields contents along with 'isolate' and 'migrate'
> callbacks.
> 
> Co-developed-by: Christoph Lameter <cl@...ux.com>
> Signed-off-by: Tobin C. Harding <tobin@...nel.org>
> ---
>  include/linux/slab.h     | 70 ++++++++++++++++++++++++++++++++++++++++
>  include/linux/slub_def.h |  3 ++
>  mm/slub.c                | 59 +++++++++++++++++++++++++++++----
>  3 files changed, 126 insertions(+), 6 deletions(-)

Reviewed-by: Roman Gushchin <guro@...com>

Thanks!