netdev - Re: [PATCH v2 bpf-next 00/13] bpf: Introduce bpf_mem_cache_free

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Date: Sat, 24 Jun 2023 15:09:32 +0800
From: Hou Tao <houtao@...weicloud.com>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>, daniel@...earbox.net,
 andrii@...nel.org, void@...ifault.com, paulmck@...nel.org
Cc: tj@...nel.org, rcu@...r.kernel.org, netdev@...r.kernel.org,
 bpf@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH v2 bpf-next 00/13] bpf: Introduce
 bpf_mem_cache_free_rcu().

Hi,

On 6/24/2023 11:13 AM, Alexei Starovoitov wrote:
> From: Alexei Starovoitov <ast@...nel.org>
>
> v1->v2:
> - Fixed race condition spotted by Hou. Patch 7.
>
> v1:
>
> Introduce bpf_mem_cache_free_rcu() that is similar to kfree_rcu except
> the objects will go through an additional RCU tasks trace grace period
> before being freed into slab.
>
> Patches 1-9 - a bunch of prep work
> Patch 10 - a patch from Paul that exports rcu_request_urgent_qs_task().
> Patch 12 - the main bpf_mem_cache_free_rcu patch.
> Patch 13 - use it in bpf_cpumask.
Should we allow mixed use of bpf_mem_cache_free() and bpf_mem_free_rcu()
? From the implementation, it seems the mixed use is allowed, right ? I
will try to hack htab to test such use case.