linux-kernel - Re: [PATCH] mm: don't show nr_indirectly

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Message-ID: <30986543-bd47-80bc-354c-727792f86547@suse.cz>
Date:   Fri, 27 Apr 2018 13:06:56 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Roman Gushchin <guro@...com>
Cc:     David Rientjes <rientjes@...gle.com>,
        Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        kernel-team@...com, Matthew Wilcox <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH] mm: don't show nr_indirectly_reclaimable in /proc/vmstat

On 04/27/2018 12:55 PM, Roman Gushchin wrote:
> On Fri, Apr 27, 2018 at 11:17:01AM +0200, Vlastimil Babka wrote:
>> On 04/26/2018 11:55 PM, David Rientjes wrote:
>>>
>>> Implementing this counter as a vmstat doesn't make much sense based on how 
>>> it's used.  Do you have a link to what Vlastimil proposed?  I haven't seen 
>>> mention of alternative ideas.
>>
>> It was in the original thread, see e.g.
>> <08524819-14ef-81d0-fa90-d7af13c6b9d5@...e.cz>
>>
>> However it will take some time to get that in mainline, and meanwhile
>> the current implementation does prevent a DOS. So I doubt it can be
>> fully reverted - as a compromise I just didn't want the counter to
>> become ABI. TBH though, other people at LSF/MM didn't seem concerned
>> that /proc/vmstat is an ABI that we can't change (i.e. counters have
>> been presumably removed in the past already).
>>
> 
> Thank you, Vlastimil!
> That pretty much matches my understanding of the case.
> 
> BTW, are you planning to work on supporting reclaimable objects
> by slab allocators?

Yeah, soon!

Vlastimil

> Thanks!
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