• Andrew Morton's avatar
    [PATCH] Inefficient TLB flush fix · 68d01416
    Andrew Morton authored
    From: Martin Hicks <mort@wildopensource.com>
    
    This is a patch based on one that Jack Steiner sent to the ia64 list in
    November.  The original thread can be found at:
    
    http://marc.theaimsgroup.com/?l=linux-ia64&m=106869606922555&w=2
    
    I created the little wrapper function that was requested.  I think the only
    other arch, other than ia64, that doesn't at least include asm-generic/tlb.h
    is arm.
    
    
    Something appears broken in TLB flushing on IA64 (& possibly other
    architectures).  Functionally, it works but performance is bad on systems
    with large cpu counts.
    
    The result is that TLB flushing in exit_mmap() is frequently being done via
    IPIs to all cpus rather than with a "ptc" instruction or with a new
    context..
    68d01416
tlb.h 6.72 KB