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Sat, 31 Oct 2026 15:50:56 -0700 (PDT) Received: from localhost ([153.61.198.246]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3ae85cb91e5sm4575724a91.0.2026.10.31.15.50.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 31 Oct 2026 15:50:56 -0700 (PDT) Content-Type: text/plain; charset=UTF-8 Date: Sat, 31 Oct 2026 22:50:56 +0000 Message-Id: From: "Alexei Starovoitov" To: , Cc: , , , , , , , Subject: Re: [PATCH bpf v2 7/9] bpf: One may_goto time slice per prog invocation In-Reply-To: <73b8a2912eb3c15e4721bb685bf2231afec7537b620367e257ee1a0d41058a19@mail.kernel.org> References: <20261031215543.682284-8-alexei.starovoitov@gmail.com> <73b8a2912eb3c15e4721bb685bf2231afec7537b620367e257ee1a0d41058a19@mail.kernel.org> Content-Transfer-Encoding: 8bit X-Mailing-List: bpf@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 On Sat, Oct 31, 2026 at 03:37 PM bot+bpf-ci@kernel.org wrote: >> + insn_buf[cnt++] = BPF_ST_MEM(BPF_DW, BPF_REG_0, timestamp_off, 0); >> + insn_buf[cnt++] = BPF_ST_MEM(BPF_DW, BPF_REG_0, owner_off, 0); > > Can a nested invocation of the same prog extend the time slice of the > invocation it interrupted without bound? It's already explained in the log and in the cover letter. > Should an async callback be protected from main-prog invocations too? For > example, the main prog prologue could leave count and timestamp alone while > owner is set, or the async callers could mark the prog as active so that a > nested invocation of it is skipped. Same limitation. Both ideas cost more than they fix.