Messages in this thread | | | Date | Tue, 24 Jan 2023 17:43:47 +0100 | From | Oleg Nesterov <> | Subject | Re: [PATCH 3/3] ptrace,syscall_user_dispatch: add a getter/setter for sud configuration |
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I won't really argue, but...
On 01/24, Gregory Price wrote: > > On Mon, Jan 23, 2023 at 08:52:29PM +0100, Oleg Nesterov wrote: > > On 01/23, Gregory Price wrote: > > > > > > So i think dropping 2/3 in the list is good. If you concur i'll do > > > that. > > > > Well I obviously think that 2/3 should be dropped ;) > > > > As for 1/3 and 3/3, feel free to add my reviewed-by. > > > > Oleg. > > > > I'm actually going to walk my agreement back. > > After one more review, the need for the proc/status entry is not to > decide whether to dump SUD settings, but for use in deciding whether to > set the SUSPEND_SYSCALL_DISPATCH option from patch 1/3.
Rather than read /proc/pid/status, CRIU can just do PTRACE_GET_SYSCALL_USER_DISPATCH_CONFIG unconditionally and check syscall_user_dispatch_config.mode ?
Why do want to expose SYSCALL_USER_DISPATCH in /proc/status? If this task is not stopped you can't trust this value anyway. If it is stopped, I don't think ptrace(PTRACE_GET_SYSCALL_USER_DISPATCH_CONFIG) is slower than reading /proc.
but perhaps I missed something?
Oleg.
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