From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
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: Wed, 14 Jan 2026 16:07:47 +0100 [thread overview]
Message-ID: <20260114150747.ziWhVVQM@linutronix.de> (raw)
In-Reply-To: <d8d25eb3-63c4-4449-ae9c-a7e4f207a2bc@suse.cz>
On 2026-01-14 15:05:34 [+0100], Vlastimil Babka wrote:
> > Yes IIRC Hao Li pointed that out before. We'll be able to remove that
> > !preemptible() check that we area about to add by the patch above.
> >
> > But I'm not sure we can remove (or "not put back") the "in_nmi() ||
> > in_hardirq()" too, because as you said it was added with different reasoning
> > initially?
>
> Ah right, it was "copied" from alloc_frozen_pages_nolock_noprof() where it's
> explained more, and AFAICS will be still applicable with sheaves. We should
> add a comment to kmalloc_nolock() referring to the
> alloc_frozen_pages_nolock_noprof() comment...
Right. This looks halfway what I remember. And this was works in atomic
context on RT because of rmqueue_pcplist()/ pcp_spin_trylock() usage.
Sebastian
next prev parent reply other threads:[~2026-01-14 15:07 UTC|newest]
Thread overview: 40+ 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 11:14 ` Harry Yoo
2026-01-14 13:02 ` 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
2026-01-14 13:57 ` Vlastimil Babka
2026-01-14 14:05 ` Vlastimil Babka
2026-01-14 15:07 ` Sebastian Andrzej Siewior [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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