Messages in this thread | | | Date | Sun, 25 Jan 2009 15:08:18 +0300 | From | Alexey Dobriyan <> | Subject | Re: Migration of kernel interfaces to seq_files breaks pread() consumers |
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On Sat, Jan 24, 2009 at 06:19:24PM -0800, Andrew Morton wrote: > On Fri, 16 Jan 2009 23:51:35 -0800 (PST) Paul Turner <pjt@google.com> wrote: > > > > > (Specifically) Several interfaces under /proc have been migrated to use > > seq_files. This was previously observed to be a problem with VMware's > > reading of /proc/uptime. We're now running into the same problem on > > /proc/<pid>/stat; we have many consumers performing preads on this > > interface which break under new kernels. > > > > Reverting these migrations presents other problems and doesn't scale with > > everyones' pet dependencies over an abi that's been > > broken :( > > We changed userspace-visible behaviour and broke real applications. > This is a serious matter. So serious in fact that your report has > languished without reply for a week. > > Reverting those changes until we have a suitable reimplementation which > doesn't bust userspace is 100% justifiable. > > In which kernel versions is this regression present? > > What would a revert look like? Big and ugly or small and simple? Do > the original commits (which were they?) still revert OK?
This is bug http://bugzilla.kernel.org/show_bug.cgi?id=11856 Some of us think what to do here.
Original patch not revertable as is.
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