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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1745811420; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5mgjhUpiTMjjN/y1DN45zRe/y1CtVNZ7gASyknJ+oe4=; b=Gf5dRr3TIZDIRx58GflQe6YhjrDUw+0tzYVZbiKzXUNkPSh7HUd7ek/cBcTFcLuHz3q+G4 96GXvmnprLNKAGeRu8Zk/E1HlHIvJXfcWn8DjkRrxGuKHhy7GYP+ik89uT0QxKhw9T72Vp oJoSXAS2Ltc8+hfooGk4XMHgY8G/unk= From: Roman Gushchin To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Alexei Starovoitov , Johannes Weiner , Michal Hocko , Shakeel Butt , Suren Baghdasaryan , David Rientjes , Josh Don , Chuyi Zhou , cgroups@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org, Roman Gushchin Subject: [PATCH rfc 09/12] sched: psi: bpf hook to handle psi events Date: Mon, 28 Apr 2025 03:36:14 +0000 Message-ID: <20250428033617.3797686-10-roman.gushchin@linux.dev> In-Reply-To: <20250428033617.3797686-1-roman.gushchin@linux.dev> References: <20250428033617.3797686-1-roman.gushchin@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: B5E18C0002 X-Stat-Signature: 8ez9igqzf6sof8ry3p1fpyokemdyfgyu X-HE-Tag: 1745811421-645096 X-HE-Meta: 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 CDXBPLNg FuRlao4F+NrRLam15CPLq2Kt8tDGLZtpznzrOLc8Pr9yAH1DgRT5V7JpYmBOpdKnb6b/Rm/zkWQjsOAbm9qWrfFQl9VPvKKtW/aVNMb8lQALS3ztOGYBMZEg/ipxWKYJvkP8Xn/zyMI9fG+mJ8Q/SFz7a9XTphJ+zprbVMZ6OoBlpwe0= 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: Introduce a bpf hook to handle psi events. The primary intended purpose of this hook is to declare OOM events based on the reaching a certain memory pressure level, similar to what systemd-oomd and oomd are doing in userspace. Signed-off-by: Roman Gushchin --- kernel/sched/psi.c | 36 +++++++++++++++++++++++++++++++++++- 1 file changed, 35 insertions(+), 1 deletion(-) diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c index 1396674fa722..4c4eb4ead8f6 100644 --- a/kernel/sched/psi.c +++ b/kernel/sched/psi.c @@ -176,6 +176,32 @@ static void psi_avgs_work(struct work_struct *work); static void poll_timer_fn(struct timer_list *t); +#ifdef CONFIG_BPF_SYSCALL +__bpf_hook_start(); + +__weak noinline int bpf_handle_psi_event(struct psi_trigger *t) +{ + return 0; +} + +__bpf_hook_end(); + +BTF_KFUNCS_START(bpf_psi_hooks) +BTF_ID_FLAGS(func, bpf_handle_psi_event, KF_SLEEPABLE) +BTF_KFUNCS_END(bpf_psi_hooks) + +static const struct btf_kfunc_id_set bpf_psi_hook_set = { + .owner = THIS_MODULE, + .set = &bpf_psi_hooks, +}; + +#else +static inline int bpf_handle_psi_event(struct psi_trigger *t) +{ + return 0; +} +#endif + static void group_init(struct psi_group *group) { int cpu; @@ -489,6 +515,7 @@ static void update_triggers(struct psi_group *group, u64 now, /* Generate an event */ if (cmpxchg(&t->event, 0, 1) == 0) { + bpf_handle_psi_event(t); if (t->of) kernfs_notify(t->of->kn); else @@ -1655,6 +1682,8 @@ static const struct proc_ops psi_irq_proc_ops = { static int __init psi_proc_init(void) { + int err = 0; + if (psi_enable) { proc_mkdir("pressure", NULL); proc_create("pressure/io", 0666, NULL, &psi_io_proc_ops); @@ -1662,9 +1691,14 @@ static int __init psi_proc_init(void) proc_create("pressure/cpu", 0666, NULL, &psi_cpu_proc_ops); #ifdef CONFIG_IRQ_TIME_ACCOUNTING proc_create("pressure/irq", 0666, NULL, &psi_irq_proc_ops); +#endif +#ifdef CONFIG_BPF_SYSCALL + err = register_btf_fmodret_id_set(&bpf_psi_hook_set); + if (err) + pr_err("error while registering bpf psi hooks: %d", err); #endif } - return 0; + return err; } module_init(psi_proc_init); -- 2.49.0.901.g37484f566f-goog