From: Hou Tao <houtao@huaweicloud.com>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: tj@kernel.org, rcu@vger.kernel.org, netdev@vger.kernel.org,
bpf@vger.kernel.org, kernel-team@fb.com, daniel@iogearbox.net,
andrii@kernel.org, void@manifault.com, paulmck@kernel.org
Subject: Re: [PATCH v4 bpf-next 12/14] bpf: Introduce bpf_mem_free_rcu() similar to kfree_rcu().
Date: Fri, 7 Jul 2023 09:45:15 +0800 [thread overview]
Message-ID: <2c09b7d7-b91c-c561-3fd6-b8483aab01dc@huaweicloud.com> (raw)
In-Reply-To: <20230706033447.54696-13-alexei.starovoitov@gmail.com>
On 7/6/2023 11:34 AM, Alexei Starovoitov wrote:
> From: Alexei Starovoitov <ast@kernel.org>
>
> Introduce bpf_mem_[cache_]free_rcu() similar to kfree_rcu().
> Unlike bpf_mem_[cache_]free() that links objects for immediate reuse into
> per-cpu free list the _rcu() flavor waits for RCU grace period and then moves
> objects into free_by_rcu_ttrace list where they are waiting for RCU
> task trace grace period to be freed into slab.
>
> The life cycle of objects:
> alloc: dequeue free_llist
> free: enqeueu free_llist
> free_rcu: enqueue free_by_rcu -> waiting_for_gp
> free_llist above high watermark -> free_by_rcu_ttrace
> after RCU GP waiting_for_gp -> free_by_rcu_ttrace
> free_by_rcu_ttrace -> waiting_for_gp_ttrace -> slab
>
> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Hou Tao <houtao1@huawei.com>
next prev parent reply other threads:[~2023-07-07 1:45 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-06 3:34 [PATCH v4 bpf-next 00/14] bpf: Introduce bpf_mem_cache_free_rcu() Alexei Starovoitov
2023-07-06 3:34 ` [PATCH v4 bpf-next 01/14] bpf: Rename few bpf_mem_alloc fields Alexei Starovoitov
2023-07-06 3:34 ` [PATCH v4 bpf-next 02/14] bpf: Simplify code of destroy_mem_alloc() with kmemdup() Alexei Starovoitov
2023-07-06 3:34 ` [PATCH v4 bpf-next 03/14] bpf: Let free_all() return the number of freed elements Alexei Starovoitov
2023-07-06 3:34 ` [PATCH v4 bpf-next 04/14] bpf: Refactor alloc_bulk() Alexei Starovoitov
2023-07-06 3:34 ` [PATCH v4 bpf-next 05/14] bpf: Factor out inc/dec of active flag into helpers Alexei Starovoitov
2023-07-06 3:34 ` [PATCH v4 bpf-next 06/14] bpf: Further refactor alloc_bulk() Alexei Starovoitov
2023-07-06 3:34 ` [PATCH v4 bpf-next 07/14] bpf: Change bpf_mem_cache draining process Alexei Starovoitov
2023-07-06 12:55 ` Hou Tao
2023-07-06 3:34 ` [PATCH v4 bpf-next 08/14] bpf: Add a hint to allocated objects Alexei Starovoitov
2023-07-06 3:34 ` [PATCH v4 bpf-next 09/14] bpf: Allow reuse from waiting_for_gp_ttrace list Alexei Starovoitov
2023-07-07 2:07 ` Hou Tao
2023-07-07 2:12 ` Alexei Starovoitov
2023-07-07 3:38 ` Hou Tao
2023-07-07 4:16 ` Alexei Starovoitov
2023-07-07 4:37 ` Hou Tao
2023-07-07 16:11 ` Alexei Starovoitov
2023-07-07 17:47 ` Paul E. McKenney
2023-07-07 22:22 ` Joel Fernandes
2023-07-08 7:03 ` Hou Tao
2023-07-10 4:45 ` Paul E. McKenney
2023-07-06 3:34 ` [PATCH v4 bpf-next 10/14] rcu: Export rcu_request_urgent_qs_task() Alexei Starovoitov
2023-07-06 3:34 ` [PATCH v4 bpf-next 11/14] selftests/bpf: Improve test coverage of bpf_mem_alloc Alexei Starovoitov
2023-07-06 3:34 ` [PATCH v4 bpf-next 12/14] bpf: Introduce bpf_mem_free_rcu() similar to kfree_rcu() Alexei Starovoitov
2023-07-07 1:45 ` Hou Tao [this message]
2023-07-07 2:10 ` Alexei Starovoitov
2023-07-07 4:05 ` Hou Tao
2023-07-08 7:00 ` Hou Tao
2023-07-06 3:34 ` [PATCH v4 bpf-next 13/14] bpf: Convert bpf_cpumask to bpf_mem_cache_free_rcu Alexei Starovoitov
2023-07-06 3:34 ` [PATCH v4 bpf-next 14/14] bpf: Add object leak check Alexei Starovoitov
2023-07-12 21:50 ` [PATCH v4 bpf-next 00/14] bpf: Introduce bpf_mem_cache_free_rcu() patchwork-bot+netdevbpf
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