[lkml]   [2012]   [Apr]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    Subject[PATCH 0/2] [RFC] Volatile Ranges (v6)
    Just wanted to send out another iteration of the volatile range code
    for review and comment.

    This revision handles some improved coalescing logic, fixes some bugs
    in the range tree management, and also utilizes a hash tabe to avoid
    bloating the address_space structure with range_tree pointers.

    Still looking for guidence on what a better interface for this might be
    as well as thoughts on how to best drop the ranges under memory pressure
    (vmtruncate_region is pretty close to what I want, but lockdep makes it
    clear that its not really safe to call from a shrinker).

    Another detail is that by hanging the volatile ranges off of the
    address_space, the volatility for tmpfs files persists even when no one
    has an open fd on the file. This could cause some surprises if application
    A marked some pages volatile and died, then application B opened the file
    and had pages dropped out underneith it while it was being used. I suspect
    I need to clean up the volatility when all fds are dropped. But any extra
    insight would be useful here.

    Thanks for the continued advice and feedback!

    CC: Andrew Morton <>
    CC: Android Kernel Team <>
    CC: Robert Love <>
    CC: Mel Gorman <>
    CC: Hugh Dickins <>
    CC: Dave Hansen <>
    CC: Rik van Riel <>
    CC: Dmitry Adamushko <>
    CC: Dave Chinner <>
    CC: Neil Brown <>
    CC: Andrea Righi <>
    CC: Aneesh Kumar K.V <>

    John Stultz (2):
    [RFC] Range tree implementation
    [RFC] fadvise: Add _VOLATILE,_ISVOLATILE, and _NONVOLATILE flags

    fs/inode.c | 2 +
    include/linux/fadvise.h | 5 +
    include/linux/rangetree.h | 56 ++++++
    include/linux/volatile.h | 14 ++
    lib/Makefile | 2 +-
    lib/rangetree.c | 128 +++++++++++++
    mm/Makefile | 2 +-
    mm/fadvise.c | 16 ++-
    mm/volatile.c | 440 +++++++++++++++++++++++++++++++++++++++++++++
    9 files changed, 662 insertions(+), 3 deletions(-)
    create mode 100644 include/linux/rangetree.h
    create mode 100644 include/linux/volatile.h
    create mode 100644 lib/rangetree.c
    create mode 100644 mm/volatile.c


     \ /
      Last update: 2012-04-07 02:11    [W:0.033 / U:5.528 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site