linux-kernel - Re: [PATCH v3 13/21] slab: remove defer_deactivate

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Message-ID: <CAJuCfpH3DVwK7FqfKb3WChWyz_ZJvECBf57Ehxr7qCzS=Ym_8g@mail.gmail.com>
Date: Wed, 21 Jan 2026 17:11:47 +0000
From: Suren Baghdasaryan <surenb@...gle.com>
To: Hao Li <hao.li@...ux.dev>
Cc: Vlastimil Babka <vbabka@...e.cz>, Harry Yoo <harry.yoo@...cle.com>, 
	Petr Tesarik <ptesarik@...e.com>, Christoph Lameter <cl@...two.org>, David Rientjes <rientjes@...gle.com>, 
	Roman Gushchin <roman.gushchin@...ux.dev>, Andrew Morton <akpm@...ux-foundation.org>, 
	Uladzislau Rezki <urezki@...il.com>, "Liam R. Howlett" <Liam.Howlett@...cle.com>, 
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Alexei Starovoitov <ast@...nel.org>, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, linux-rt-devel@...ts.linux.dev, 
	bpf@...r.kernel.org, kasan-dev@...glegroups.com
Subject: Re: [PATCH v3 13/21] slab: remove defer_deactivate_slab()

On Tue, Jan 20, 2026 at 9:35 AM Hao Li <hao.li@...ux.dev> wrote:
>
> On Fri, Jan 16, 2026 at 03:40:33PM +0100, Vlastimil Babka wrote:
> > There are no more cpu slabs so we don't need their deferred
> > deactivation. The function is now only used from places where we
> > allocate a new slab but then can't spin on node list_lock to put it on
> > the partial list. Instead of the deferred action we can free it directly
> > via __free_slab(), we just need to tell it to use _nolock() freeing of
> > the underlying pages and take care of the accounting.
> >
> > Since free_frozen_pages_nolock() variant does not yet exist for code
> > outside of the page allocator, create it as a trivial wrapper for
> > __free_frozen_pages(..., FPI_TRYLOCK).
> >
> > Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> > ---
> >  mm/internal.h   |  1 +
> >  mm/page_alloc.c |  5 +++++
> >  mm/slab.h       |  8 +-------
> >  mm/slub.c       | 56 ++++++++++++++++++++------------------------------------
> >  4 files changed, 27 insertions(+), 43 deletions(-)
> >
>
> Looks good to me.
> Reviewed-by: Hao Li <hao.li@...ux.dev>

Reviewed-by: Suren Baghdasaryan <surenb@...gle.com>

>
> --
> Thanks,
> Hao