Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: Getting rid of freezer for suspend [was Re: [fuse-devel] [PATCH] fuse: make fuse daemon frozen along with kernel threads] | Date | Thu, 14 Feb 2013 18:38:02 +0100 |
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On Thursday, February 14, 2013 02:09:50 PM Miklos Szeredi wrote: > On Thu, Feb 14, 2013 at 1:11 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote: > > On Thursday, February 14, 2013 11:41:16 AM Miklos Szeredi wrote: > > >> > >> It is essentially the same mechanism that is used to delay the > >> freezing of kernel threads after userspace tasks have been frozen. > >> Except it's a lot more difficult to determine which userspace tasks > >> need to be suspended late and which aren't. > > > > Well, I suppose that information is available to user space. > > > > Do we need an interface for a process to mark itself as PF_FREEZE_LATE or > > do we need an interface for one process to mark another process as > > PF_FREEZE_LATE, or both? > > As a first step marking self with PF_FREEZE_LATE and inheriting this > flag across fork/clone would work for most cases, I think.
OK, so we can just have a switch for that in /proc I suppose.
> Marking an unrelated process would have all sorts of issues: Who has > permission to do this? Won't it be misused to "fix" random freezer > issues.
Yes, that's why I was asking.
Thanks, Rafael
-- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center.
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