• Mathieu Desnoyers's avatar
    membarrier: Provide core serializing command, *_SYNC_CORE · 70216e18
    Mathieu Desnoyers authored
    Provide core serializing membarrier command to support memory reclaim
    by JIT.
    
    Each architecture needs to explicitly opt into that support by
    documenting in their architecture code how they provide the core
    serializing instructions required when returning from the membarrier
    IPI, and after the scheduler has updated the curr->mm pointer (before
    going back to user-space). They should then select
    ARCH_HAS_MEMBARRIER_SYNC_CORE to enable support for that command on
    their architecture.
    
    Architectures selecting this feature need to either document that
    they issue core serializing instructions when returning to user-space,
    or implement their architecture-specific sync_core_before_usermode().
    Signed-off-by: default avatarMathieu Desnoyers <mathieu.desnoyers@efficios.com>
    Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
    Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Andrea Parri <parri.andrea@gmail.com>
    Cc: Andrew Hunter <ahh@google.com>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Avi Kivity <avi@scylladb.com>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Cc: Boqun Feng <boqun.feng@gmail.com>
    Cc: Dave Watson <davejwatson@fb.com>
    Cc: David Sehr <sehr@google.com>
    Cc: Greg Hackmann <ghackmann@google.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Maged Michael <maged.michael@gmail.com>
    Cc: Michael Ellerman <mpe@ellerman.id.au>
    Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Russell King <linux@armlinux.org.uk>
    Cc: Will Deacon <will.deacon@arm.com>
    Cc: linux-api@vger.kernel.org
    Cc: linux-arch@vger.kernel.org
    Link: http://lkml.kernel.org/r/20180129202020.8515-9-mathieu.desnoyers@efficios.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    70216e18
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