• Andy Lutomirski's avatar
    mm, x86/mm: Make the batched unmap TLB flush API more generic · e73ad5ff
    Andy Lutomirski authored
    try_to_unmap_flush() used to open-code a rather x86-centric flush
    sequence: local_flush_tlb() + flush_tlb_others().  Rearrange the
    code so that the arch (only x86 for now) provides
    arch_tlbbatch_add_mm() and arch_tlbbatch_flush() and the core code
    calls those functions instead.
    
    I'll want this for x86 because, to enable address space ids, I can't
    support the flush_tlb_others() mode used by exising
    try_to_unmap_flush() implementation with good performance.  I can
    support the new API fairly easily, though.
    
    I imagine that other architectures may be in a similar position.
    Architectures with strong remote flush primitives (arm64?) may have
    even worse performance problems with flush_tlb_others() the way that
    try_to_unmap_flush() uses it.
    Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
    Acked-by: default avatarKees Cook <keescook@chromium.org>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Borislav Petkov <bpetkov@suse.de>
    Cc: Dave Hansen <dave.hansen@intel.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Mel Gorman <mgorman@suse.de>
    Cc: Michal Hocko <mhocko@suse.com>
    Cc: Nadav Amit <nadav.amit@gmail.com>
    Cc: Nadav Amit <namit@vmware.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Rik van Riel <riel@redhat.com>
    Cc: Sasha Levin <sasha.levin@oracle.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: linux-mm@kvack.org
    Link: http://lkml.kernel.org/r/19f25a8581f9fb77876b7ff3b001f89835e34ea3.1495492063.git.luto@kernel.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    e73ad5ff
tlbflush.h 8.4 KB