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    SubjectRe: [PATCH v2 00/36] remove in-kernel syscall invocations (part 1)
    On Fri, Mar 16, 2018 at 09:01:11AM +0000, Zhang, Ning A wrote:
    > 在 2018-03-15四的 20:04 +0100,Dominik Brodowski写道:
    > > Here is a re-spin of the first set of patches which reduce the number of
    > > syscall invocations from within the kernel; the RFC may be found at
    > >
    > > The rationale for this change is described in patch 1 as follows:
    > >
    > > The syscall entry points to the kernel defined by SYSCALL_DEFINEx()
    > > and COMPAT_SYSCALL_DEFINEx() should only be called from userspace
    > > through kernel entry points, but not from the kernel itself. This
    > > will allow cleanups and optimizations to the entry paths *and* to
    > > the parts of the kernel code which currently need to pretend to be
    > > userspace in order to make use of syscalls.
    >
    > I think this is really bad to change syscalls one by one, to do_*
    >
    > why not change SYSCALL_DEFINEx to define kernel wrappers?

    Basically, for two reasons: First, only a subset of all syscalls require
    such wrappers -- only about a third of all syscalls are called from within
    the kernel at the moment (rough guess). Second, and more important: We want
    to reduce the amount of such usage; see, e.g., the messages by Christoph and
    Arnd in this thread.

    Thanks,
    Dominik

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