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Tue, 26 Aug 2025 00:20:28 -0700 (PDT) From: Yafang Shao To: akpm@linux-foundation.org, david@redhat.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, hannes@cmpxchg.org, usamaarif642@gmail.com, gutierrez.asier@huawei-partners.com, willy@infradead.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, ameryhung@gmail.com, rientjes@google.com, corbet@lwn.net Cc: bpf@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, Yafang Shao Subject: [PATCH v6 mm-new 02/10] mm: thp: add a new kfunc bpf_mm_get_mem_cgroup() Date: Tue, 26 Aug 2025 15:19:40 +0800 Message-Id: <20250826071948.2618-3-laoar.shao@gmail.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) In-Reply-To: <20250826071948.2618-1-laoar.shao@gmail.com> References: <20250826071948.2618-1-laoar.shao@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 4AC7320006 X-Rspamd-Server: rspam04 X-Rspam-User: X-Stat-Signature: dmyzw15ztudo1mnkm3tyb5ugc9c5xjic X-HE-Tag: 1756192830-361754 X-HE-Meta: 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 PsN73oKR 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: We will utilize this new kfunc bpf_mm_get_mem_cgroup() to retrieve the associated mem_cgroup from the given @mm. The obtained mem_cgroup must be released by calling bpf_put_mem_cgroup() as a paired operation. Signed-off-by: Yafang Shao --- mm/bpf_thp.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 50 insertions(+), 1 deletion(-) diff --git a/mm/bpf_thp.c b/mm/bpf_thp.c index fbff3b1bb988..b757e8f425fd 100644 --- a/mm/bpf_thp.c +++ b/mm/bpf_thp.c @@ -175,10 +175,59 @@ static struct bpf_struct_ops bpf_bpf_thp_ops = { .name = "bpf_thp_ops", }; +__bpf_kfunc_start_defs(); + +/** + * bpf_mm_get_mem_cgroup - Get the memory cgroup associated with a mm_struct. + * @mm: The mm_struct to query + * + * The obtained mem_cgroup must be released by calling bpf_put_mem_cgroup(). + * + * Return: The associated mem_cgroup on success, or NULL on failure. Note that + * this function depends on CONFIG_MEMCG being enabled - it will always return + * NULL if CONFIG_MEMCG is not configured. + */ +__bpf_kfunc struct mem_cgroup *bpf_mm_get_mem_cgroup(struct mm_struct *mm) +{ + return get_mem_cgroup_from_mm(mm); +} + +/** + * bpf_put_mem_cgroup - Release a memory cgroup obtained from bpf_mm_get_mem_cgroup() + * @memcg: The memory cgroup to release + */ +__bpf_kfunc void bpf_put_mem_cgroup(struct mem_cgroup *memcg) +{ +#ifdef CONFIG_MEMCG + if (!memcg) + return; + css_put(&memcg->css); +#endif +} + +__bpf_kfunc_end_defs(); + +BTF_KFUNCS_START(bpf_thp_ids) +BTF_ID_FLAGS(func, bpf_mm_get_mem_cgroup, KF_TRUSTED_ARGS | KF_ACQUIRE | KF_RET_NULL) +BTF_ID_FLAGS(func, bpf_put_mem_cgroup, KF_RELEASE) +BTF_KFUNCS_END(bpf_thp_ids) + +static const struct btf_kfunc_id_set bpf_thp_set = { + .owner = THIS_MODULE, + .set = &bpf_thp_ids, +}; + static int __init bpf_thp_ops_init(void) { - int err = register_bpf_struct_ops(&bpf_bpf_thp_ops, bpf_thp_ops); + int err; + + err = register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, &bpf_thp_set); + if (err) { + pr_err("bpf_thp: Failed to register kfunc sets (%d)\n", err); + return err; + } + err = register_bpf_struct_ops(&bpf_bpf_thp_ops, bpf_thp_ops); if (err) pr_err("bpf_thp: Failed to register struct_ops (%d)\n", err); return err; -- 2.47.3