[lkml]   [2009]   [Jul]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH 05/10] ksm: no debug in page_dup_rmap()
    Izik Eidus wrote:
    > From: Hugh Dickins <>
    > page_dup_rmap(), used on each mapped page when forking, was originally
    > just an inline atomic_inc of mapcount. 2.6.22 added CONFIG_DEBUG_VM
    > out-of-line checks to it, which would need to be ever-so-slightly
    > complicated to allow for the PageKsm() we're about to define.
    > But I think these checks never caught anything. And if it's coding
    > errors we're worried about, such checks should be in page_remove_rmap()
    > too, not just when forking; whereas if it's pagetable corruption we're
    > worried about, then they shouldn't be limited to CONFIG_DEBUG_VM.

    Acked-by: Rik van Riel <>

    All rights reversed.

     \ /
      Last update: 2009-07-20 20:15    [W:0.024 / U:0.076 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site