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Howlett" , Vlastimil Babka , Mike Rapoport , Michal Hocko Subject: Re: [PATCH RFC v3 2/4] exec: introduce struct task_exec_state Message-ID: References: <20260520-work-task_exec_state-v3-0-69f895bc1385@kernel.org> <20260520-work-task_exec_state-v3-2-69f895bc1385@kernel.org> MIME-Version: 1.0 In-Reply-To: <20260520-work-task_exec_state-v3-2-69f895bc1385@kernel.org> X-Scanned-By: MIMEDefang 3.6 on 10.30.177.95 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: B0nceZTcrF-qdql_Kf8e_WFFKy5C5OZTwR3Dc34uFsQ_1779462017 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: DD8992001F X-Stat-Signature: 4xrmeruom4hso8whs1cztfy6iuf7ffe1 X-HE-Tag: 1779462025-702717 X-HE-Meta: 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 uCCiaY+z keTm8uWZsPMLIJSBBXPy0Lgq4vfWXDP2k4gWhf357Z1C2xw1kIDoJDwcH0fvT9HLhdBGiCniAfx8DgpJrxmIYtA4fap4ag1phfBpwzYcd4DOsnoi8Lp0N/NPrS7ND9zNsD944HKIZhYRV7xHUJFj5VSpyEzrHtQmqnHopHm9TeGeZona2eo/1hD+LaA6zur/bC64kjuDjny6tYeIuuB49HZHr6svlKix/VOKJPJY5nP7i0IgX85Jh5+CrHV8TiVMlmvPu1qfmrkVoQRdezolrTxFz39VOb0IYPoLMcvB/chIvwC8k/3jnmcnWDcQx+Srfdmor16TPV9aOiF+l7B/hW7CKtPwiFaIVyMkWfGHealMd7wL7Ylg12a8+KSLZnmrg5KwVAViIwTLgFa1/iZIrmNpNQQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 05/20, Christian Brauner (Amutable) wrote: > > --- a/include/linux/sched.h > +++ b/include/linux/sched.h > @@ -962,6 +962,8 @@ struct task_struct { > struct mm_struct *mm; > struct mm_struct *active_mm; > > + struct task_exec_state __rcu *exec_state; Sorry if this was already discussed... Can't we (later) move exec_state into signal_struct? AFAICS, the only complication is that task_still_dumpable/etc can't use tsk->signal->exec_state if tsk was alredy reaped (another thread can do exec_mmap() after that). But perhaps we can rely on pid_alive() check and return an error if the task has already passed __unhash_process() ? Oleg.