Re: [PATCH bpf-next v4 1/6] mm, bpf: Introduce try_alloc_pages() for opportunistic page allocation

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To: Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>
Subject: Re: [PATCH bpf-next v4 1/6] mm, bpf: Introduce try_alloc_pages() for opportunistic page allocation
From: Michal Hocko <mhocko@xxxxxxxx>
Date: Wed, 15 Jan 2025 09:35:32 +0100
Cc: bpf <bpf@xxxxxxxxxxxxxxx>, Andrii Nakryiko <andrii@xxxxxxxxxx>, Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Sebastian Sewior <bigeasy@xxxxxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Hou Tao <houtao1@xxxxxxxxxx>, Johannes Weiner <hannes@xxxxxxxxxxx>, Shakeel Butt <shakeel.butt@xxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Jann Horn <jannh@xxxxxxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, linux-mm <linux-mm@xxxxxxxxx>, Kernel Team <kernel-team@xxxxxx>
In-reply-to: <CAADnVQKYb+kHwaAzL5c9S8V+Wcnju+ScMbajmMj2wi6E_=Pq-g@mail.gmail.com>
References: <20250114021922.92609-1-alexei.starovoitov@gmail.com> <20250114021922.92609-2-alexei.starovoitov@gmail.com> <Z4Y9BVygLcRTjhMh@tiehlicka> <CAADnVQKYb+kHwaAzL5c9S8V+Wcnju+ScMbajmMj2wi6E_=Pq-g@mail.gmail.com>

On Tue 14-01-25 17:23:20, Alexei Starovoitov wrote:
> On Tue, Jan 14, 2025 at 2:31 AM Michal Hocko <mhocko@xxxxxxxx> wrote:
[...]
> > LGTM, I am not entirely clear on kmsan_alloc_page part though.
> 
> Which part is still confusing?

It is not confusing as much as I have no idea how the kmsan code is
supposed to work. Why do we even need to memset if __GFP_ZERO is used.

-- 
Michal Hocko
SUSE Labs

References:
- [PATCH bpf-next v4 0/6] bpf, mm: Introduce try_alloc_pages()
  - From: Alexei Starovoitov
- [PATCH bpf-next v4 1/6] mm, bpf: Introduce try_alloc_pages() for opportunistic page allocation
  - From: Alexei Starovoitov
- Re: [PATCH bpf-next v4 1/6] mm, bpf: Introduce try_alloc_pages() for opportunistic page allocation
  - From: Michal Hocko
- Re: [PATCH bpf-next v4 1/6] mm, bpf: Introduce try_alloc_pages() for opportunistic page allocation
  - From: Alexei Starovoitov

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