linux-kernel - Re: [PATCH 2/2] mm/vmalloc: Add attempt_larger_order

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Message-ID: <aUPlsxpYJz6u75Kv@milan>
Date: Thu, 18 Dec 2025 12:29:55 +0100
From: Uladzislau Rezki <urezki@...il.com>
To: Ryan Roberts <ryan.roberts@....com>
Cc: Uladzislau Rezki <urezki@...il.com>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vishal Moola <vishal.moola@...il.com>, Dev Jain <dev.jain@....com>,
	Baoquan He <bhe@...hat.com>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] mm/vmalloc: Add attempt_larger_order_alloc parameter

> On 17/12/2025 20:08, Uladzislau Rezki wrote:
> >>
> >> What do you think?
> >>
> > I think with such big improvement we do not need a configuration knob.
> > Your change will fully complete Vishal's work, i.e an idea to allocate
> > using high-order pages.
> 
> Yes agreed. How do you want to proceed? I'll tidy up my patch and post it
> properly if you like? (likely won't be until Tuesday though). Or if you prefer
> to work on it, that's fine by me too.
> 
I think it is worth you proceed with the change. Also i forgot to
mention that allocation path is improved also. If you have a look at the
perf figures you will see that a pressure on the buddy really has been
reduced. I think it is because the state of the buddy is much more healthy
now.

> Personally I think we should aim to get the fix into 6.19 to avoid the
> performance regression (even if we think the allocation pattern of those
> benchmarks is not the common case).
> 
Personally, i do not mind, let's see how it goes and what Andrew says.
 
Thank you and i am looking forward the patches!

--
Uladzislau Rezki