From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>,
Harry Yoo <harry.yoo@oracle.com>,
Petr Tesarik <ptesarik@suse.com>,
Christoph Lameter <cl@gentwo.org>,
David Rientjes <rientjes@google.com>,
Roman Gushchin <roman.gushchin@linux.dev>,
Hao Li <hao.li@linux.dev>,
Andrew Morton <akpm@linux-foundation.org>,
Uladzislau Rezki <urezki@gmail.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Suren Baghdasaryan <surenb@google.com>,
Alexei Starovoitov <ast@kernel.org>,
linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-rt-devel@lists.linux.dev, bpf <bpf@vger.kernel.org>,
kasan-dev <kasan-dev@googlegroups.com>
Subject: Re: [PATCH RFC v2 06/20] slab: make percpu sheaves compatible with kmalloc_nolock()/kfree_nolock()
Date: Tue, 13 Jan 2026 15:26:53 -0800 [thread overview]
Message-ID: <CAADnVQK0Y2ha--EndLUfk_7n8na9CfnTpvqPMYbH07+MTJ9UpA@mail.gmail.com> (raw)
In-Reply-To: <20260113183604.ykHFYvV2@linutronix.de>
On Tue, Jan 13, 2026 at 10:36 AM Sebastian Andrzej Siewior
<bigeasy@linutronix.de> wrote:
>
> On 2026-01-12 16:17:00 [+0100], Vlastimil Babka wrote:
> > --- a/mm/slub.c
> > +++ b/mm/slub.c
> > @@ -5727,6 +5742,12 @@ void *kmalloc_nolock_noprof(size_t size, gfp_t gfp_flags, int node)
> > */
> > return NULL;
> >
> > + ret = alloc_from_pcs(s, alloc_gfp, node);
> > + if (ret)
> > + goto success;
>
> I'm sorry if I am slow but this actually should actually allow
> kmalloc_nolock() allocations on PREEMPT_RT from atomic context. I am
> mentioning this because of the patch which removes the nmi+hardirq
> condtion (https://lore.kernel.org/all/20260113150639.48407-1-swarajgaikwad1925@gmail.com)
Right. With sheaves kmalloc_nolock() on RT will be more reliable.
next prev parent reply other threads:[~2026-01-13 23:27 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-12 15:16 [PATCH RFC v2 00/20] slab: replace cpu (partial) slabs with sheaves Vlastimil Babka
2026-01-12 15:16 ` [PATCH RFC v2 01/20] mm/slab: add rcu_barrier() to kvfree_rcu_barrier_on_cache() Vlastimil Babka
2026-01-13 2:08 ` Harry Yoo
2026-01-13 9:32 ` Vlastimil Babka
2026-01-13 12:31 ` Harry Yoo
2026-01-13 13:09 ` Vlastimil Babka
2026-01-14 4:56 ` Harry Yoo
2026-01-12 15:16 ` [PATCH RFC v2 02/20] mm/slab: move and refactor __kmem_cache_alias() Vlastimil Babka
2026-01-13 7:06 ` Harry Yoo
2026-01-12 15:16 ` [PATCH RFC v2 03/20] mm/slab: make caches with sheaves mergeable Vlastimil Babka
2026-01-13 7:47 ` Harry Yoo
2026-01-12 15:16 ` [PATCH RFC v2 04/20] slab: add sheaves to most caches Vlastimil Babka
2026-01-12 15:16 ` [PATCH RFC v2 05/20] slab: introduce percpu sheaves bootstrap Vlastimil Babka
2026-01-13 12:49 ` Hao Li
2026-01-12 15:17 ` [PATCH RFC v2 06/20] slab: make percpu sheaves compatible with kmalloc_nolock()/kfree_nolock() Vlastimil Babka
2026-01-13 15:42 ` Hao Li
2026-01-13 18:36 ` Sebastian Andrzej Siewior
2026-01-13 23:26 ` Alexei Starovoitov [this message]
2026-01-12 15:17 ` [PATCH RFC v2 07/20] slab: handle kmalloc sheaves bootstrap Vlastimil Babka
2026-01-12 15:17 ` [PATCH RFC v2 08/20] slab: add optimized sheaf refill from partial list Vlastimil Babka
2026-01-12 15:17 ` [PATCH RFC v2 09/20] slab: remove cpu (partial) slabs usage from allocation paths Vlastimil Babka
2026-01-14 6:07 ` Hao Li
2026-01-12 15:17 ` [PATCH RFC v2 10/20] slab: remove SLUB_CPU_PARTIAL Vlastimil Babka
2026-01-12 15:17 ` [PATCH RFC v2 11/20] slab: remove the do_slab_free() fastpath Vlastimil Babka
2026-01-12 15:17 ` [PATCH RFC v2 12/20] slab: remove defer_deactivate_slab() Vlastimil Babka
2026-01-12 15:17 ` [PATCH RFC v2 13/20] slab: simplify kmalloc_nolock() Vlastimil Babka
2026-01-14 3:31 ` Alexei Starovoitov
2026-01-12 15:17 ` [PATCH RFC v2 14/20] slab: remove struct kmem_cache_cpu Vlastimil Babka
2026-01-12 15:17 ` [PATCH RFC v2 15/20] slab: remove unused PREEMPT_RT specific macros Vlastimil Babka
2026-01-12 15:17 ` [PATCH RFC v2 16/20] slab: refill sheaves from all nodes Vlastimil Babka
2026-01-12 15:17 ` [PATCH RFC v2 17/20] slab: update overview comments Vlastimil Babka
2026-01-12 15:17 ` [PATCH RFC v2 18/20] slab: remove frozen slab checks from __slab_free() Vlastimil Babka
2026-01-12 15:17 ` [PATCH RFC v2 19/20] mm/slub: remove DEACTIVATE_TO_* stat items Vlastimil Babka
2026-01-12 15:17 ` [PATCH RFC v2 20/20] mm/slub: cleanup and repurpose some " Vlastimil Babka
2026-01-12 15:20 ` [PATCH v2 00/20] slab: replace cpu (partial) slabs with sheaves Vlastimil Babka
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