linux-kernel - Re: [PATCH v8 00/23] SLUB percpu sheaves

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Message-ID: <aOX-87tPdtuPb9Uh@infradead.org>
Date: Tue, 7 Oct 2025 23:04:35 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: Christoph Hellwig <hch@...radead.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Christoph Lameter <cl@...two.org>,
	David Rientjes <rientjes@...gle.com>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Harry Yoo <harry.yoo@...cle.com>,
	Uladzislau Rezki <urezki@...il.com>,
	Sidhartha Kumar <sidhartha.kumar@...cle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
	maple-tree@...ts.infradead.org, Alexei Starovoitov <ast@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Venkat Rao Bagalkote <venkat88@...ux.ibm.com>,
	Qianfeng Rong <rongqianfeng@...o.com>,
	Wei Yang <richard.weiyang@...il.com>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	WangYuli <wangyuli@...ontech.com>, Jann Horn <jannh@...gle.com>,
	Pedro Falcato <pfalcato@...e.de>
Subject: Re: [PATCH v8 00/23] SLUB percpu sheaves

On Tue, Oct 07, 2025 at 10:03:04AM +0200, Vlastimil Babka wrote:
> Basically it's for situations where you have an upper bound on the objects
> you might need to allocate in some restricted context where you can't fail
> but also can't reclaim etc. The steps are:

Ok, so you still need a step where you reserve, which can fail and
only after that guarantee you can allocate up to the reservation?  I.e.
not a replacement for mempools?  Just asking because I recently had
to implement a mempool_alloc_batch to allow grabbing multiple objects
out of a mempool safely for something I'm working on.