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  • Rohit Seth's avatar
    [PATCH] Make high and batch sizes of per_cpu_pagelists configurable · 8ad4b1fb
    Rohit Seth authored
    
    
    As recently there has been lot of traffic on the right values for batch and
    high water marks for per_cpu_pagelists.  This patch makes these two
    variables configurable through /proc interface.
    
    A new tunable /proc/sys/vm/percpu_pagelist_fraction is added.  This entry
    controls the fraction of pages at most in each zone that are allocated for
    each per cpu page list.  The min value for this is 8.  It means that we
    don't allow more than 1/8th of pages in each zone to be allocated in any
    single per_cpu_pagelist.
    
    The batch value of each per cpu pagelist is also updated as a result.  It
    is set to pcp->high/4.  The upper limit of batch is (PAGE_SHIFT * 8)
    
    Signed-off-by: default avatarRohit Seth <rohit.seth@intel.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    8ad4b1fb