netdev - Re: [PATCH] mm: memcontrol: only manage socket pressure for CONFIG

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Date:	Fri, 22 Jan 2016 12:25:08 +0900
From:	Masanari Iida <standby24x7@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Arnd Bergmann <arnd@...db.de>, linux-mm@...ck.org,
	netdev@...r.kernel.org,
	"cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: memcontrol: only manage socket pressure for CONFIG_INET

Hi,
I hit this while I was testing 4.5-rc1 with randconfig during merger period.
And now I noticed that it was fixed after Linus merged akpm branch.

commit eae21770b4fed5597623aad0d618190fa60426ff
Merge: e9f57eb 9f273c2
Author: Linus Torvalds <torvalds@...ux-foundation.org>
Date:   Thu Jan 21 12:32:08 2016 -0800

    Merge branch 'akpm' (patches from Andrew)

Try one commit before this (commit e9f57ebcba563e0cd532926cab83c92bb4d79360 )
DOES have an issue.
So I believe it was fixed for now.
Thanks

Masanari


On Thu, Dec 10, 2015 at 8:13 AM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Wed, 9 Dec 2015 18:05:05 -0500 Johannes Weiner <hannes@...xchg.org> wrote:
>
>> On Wed, Dec 09, 2015 at 02:28:36PM -0800, Andrew Morton wrote:
>> > On Wed, 9 Dec 2015 13:58:58 -0500 Johannes Weiner <hannes@...xchg.org> wrote:
>> > > The calls to tcp_init_cgroup() appear earlier in the series than "mm:
>> > > memcontrol: hook up vmpressure to socket pressure". However, they get
>> > > moved around a few times so fixing it earlier means respinning the
>> > > series. Andrew, it's up to you whether we take the bisectability hit
>> > > for !CONFIG_INET && CONFIG_MEMCG (how common is this?) or whether you
>> > > want me to resend the series.
>> >
>> > hm, drat, I was suspecting dependency issues here, but a test build
>> > said it was OK.
>> >
>> > Actually, I was expecting this patch series to depend on the linux-next
>> > cgroup2 changes, but that doesn't appear to be the case.  *should* this
>> > series be staged after the cgroup2 code?
>>
>> Code-wise they are independent. My stuff is finishing up the new memcg
>> control knobs, the cgroup2 stuff is changing how and when those knobs
>> are exposed from within the cgroup core. I'm not relying on any recent
>> changes in the cgroup core AFAICS, so the order shouldn't matter here.
>
> OK, thanks.
>
>> > Regarding this particular series: yes, I think we can live with a
>> > bisection hole for !CONFIG_INET && CONFIG_MEMCG users.  But I'm not
>> > sure why we're discussing bisection issues, because Arnd's build
>> > failure occurs with everything applied?
>>
>> Arnd's patches apply to the top of the stack, but they address issues
>> introduced early in the series and the problematic code gets touched a
>> lot in subsequent patches. E.g. the first build breakage is in ("net:
>> tcp_memcontrol: simplify linkage between socket and page counter")
>> when the tcp_init_cgroup() and tcp_destroy_cgroup() function calls get
>> moved around and lose the CONFIG_INET protection.
>
> Yeah, this is a pain.  I think I'll fold Arnd's fix into
> mm-memcontrol-introduce-config_memcg_legacy_kmem.patch (which is staged
> after all the other MM patches and after linux-next) and will pretend I
> didn't know about the issue ;)
>
>> Anyway, if we can live with the bisection caveat then Arnd's fixes on
>> top of the kmem series look good to me. Depending on what Vladimir
>> thinks we might want to replace the CONFIG_SLOB fix with something
>> else later on, but that shouldn't be a problem, either.
>
> I don't have a fix for the CONFIG_SLOB&&CONFIG_MEMCG issue yet.  I
> agree that it would be best to make the combination work correctly
> rather than banning it, but that does require a bit of runtime testing.
>
> --
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