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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1756141019; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=NAPZqISVKAEwgxkMeXQwIHHj6CxIXWWQHoJY30zQfUw=; b=aaxX9KoAIRU7hcngB3MtEt3ChqHOEscLudD75M3s/FotORLWw0z+bT8E63I3g9xcvYi1hC kgZyTAHgJvVA9hIGN3LpAa/tnkfmm1xMAfH4tjAX3wkJx7ZBrzt2gHYLfwy941zbce25af HTyYBnyzuYVGc/CCcOGEwiEhB5kVriY= From: Roman Gushchin To: Martin KaFai Lau Cc: Andrii Nakryiko , linux-mm@kvack.org, bpf@vger.kernel.org, Suren Baghdasaryan , Johannes Weiner , Michal Hocko , David Rientjes , Matt Bobrowski , Song Liu , Kumar Kartikeya Dwivedi , Alexei Starovoitov , Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: [PATCH v1 13/14] sched: psi: implement bpf_psi_create_trigger() kfunc In-Reply-To: (Martin KaFai Lau's message of "Fri, 22 Aug 2025 12:57:20 -0700") References: <20250818170136.209169-1-roman.gushchin@linux.dev> <20250818170136.209169-14-roman.gushchin@linux.dev> <87ect5lde2.fsf@linux.dev> Date: Mon, 25 Aug 2025 09:56:52 -0700 Message-ID: <87h5xvxru3.fsf@linux.dev> MIME-Version: 1.0 Content-Type: text/plain X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: 956D24000F X-Rspamd-Server: rspam04 X-Rspam-User: X-Stat-Signature: fibanupnfmyyfduhbxxxnnk6dbbag1p6 X-HE-Tag: 1756141021-989472 X-HE-Meta: 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 bOKCkfkW +HVs3hxKUnTaYmj6uGBRfpnjCLyd5YKb/V13NsuS59G0IDuG7i+aBcvHet4CEx4WrTstYTnsNJgsNEfQCLbNgrZDczeQFdxJRmDjCjpoHOn2yzWQ80eTTVYVgo0Xjv8/2BdnjWecFmEyFyZD5W262f/5fMoJahO8n7w/MdVArxbVNr1m6Y39AlN4ArNiif4831nwO1gHXcvYYy2amTTLSCYiDiSXpRlfU+69BeQjWwcT7Nq44uWhPfWdHgBQcuZp/nMzZeDh6bAKJ+DByPNasurBlQQ== 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: Martin KaFai Lau writes: > On 8/20/25 5:36 PM, Roman Gushchin wrote: >> It will. Idk how big of a problem it is, given that the caller needs >> a trusted reference to bpf_psi. Also, is there a simple way to constrain >> it? Wdyt? > > The bpf qdisc has the kfunc filtering. Take a look at the > bpf_qdisc_kfunc_filter in bpf_qdisc.c. Thanks! I'll take a look.