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Thu, 24 Sep 2026 14:33:34 -0700 (PDT) Content-Type: text/plain; charset=UTF-8 Date: Thu, 24 Sep 2026 21:33:33 +0000 Message-Id: Cc: , , , Subject: Re: [PATCH bpf v2 1/2] bpf: Add sleepable arena page allocation path From: "Alexei Starovoitov" To: "Emil Tsalapatis" , In-Reply-To: <20260924053621.7076-2-emil@etsalapatis.com> References: <20260924053621.7076-1-emil@etsalapatis.com> <20260924053621.7076-2-emil@etsalapatis.com> X-Mailer: mkdraft (claude review draft; edit before sending) Content-Transfer-Encoding: 8bit Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Thu, Sep 24, 2026 at 05:36 AM Emil Tsalapatis wrote: > Add a separate arena page allocation path just for sleepable callers. > The path preallocates the arena memory to be added to the tree before > taking the critical section. Another idea... can we drop pages[] and link the pages via page->pcp_llist the way apply_range_clear_cb() does on the free side ? Then both sleepable and non-sleepable allocate all pages before taking the lock and there is no need for kvcalloc vs kmalloc_nolock, batching, etc. The whole function will probably be much simpler. pw-bot: cr