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    Subject[PATCH tip/core/rcu 6/6] rcu: Update trace.txt documentation for blocked-tasks lists
    Date
    From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

    Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    ---
    Documentation/RCU/trace.txt | 21 +++++++++++++++------
    1 files changed, 15 insertions(+), 6 deletions(-)

    diff --git a/Documentation/RCU/trace.txt b/Documentation/RCU/trace.txt
    index c1a9550..b1c5c67 100644
    --- a/Documentation/RCU/trace.txt
    +++ b/Documentation/RCU/trace.txt
    @@ -158,14 +158,14 @@ o "gpnum" is the number of grace periods that have started. It is
    The output of "cat rcu/rcuhier" looks as follows, with very long lines:

    c=6902 g=6903 s=2 jfq=3 j=72c7 nfqs=13142/nfqsng=0(13142) fqlh=6 oqlen=0
    -1/1 0:127 ^0
    -3/3 0:35 ^0 0/0 36:71 ^1 0/0 72:107 ^2 0/0 108:127 ^3
    -3/3f 0:5 ^0 2/3 6:11 ^1 0/0 12:17 ^2 0/0 18:23 ^3 0/0 24:29 ^4 0/0 30:35 ^5 0/0 36:41 ^0 0/0 42:47 ^1 0/0 48:53 ^2 0/0 54:59 ^3 0/0 60:65 ^4 0/0 66:71 ^5 0/0 72:77 ^0 0/0 78:83 ^1 0/0 84:89 ^2 0/0 90:95 ^3 0/0 96:101 ^4 0/0 102:107 ^5 0/0 108:113 ^0 0/0 114:119 ^1 0/0 120:125 ^2 0/0 126:127 ^3
    +1/1 .>. 0:127 ^0
    +3/3 .>. 0:35 ^0 0/0 .>. 36:71 ^1 0/0 .>. 72:107 ^2 0/0 .>. 108:127 ^3
    +3/3f .>. 0:5 ^0 2/3 .>. 6:11 ^1 0/0 .>. 12:17 ^2 0/0 .>. 18:23 ^3 0/0 .>. 24:29 ^4 0/0 .>. 30:35 ^5 0/0 .>. 36:41 ^0 0/0 .>. 42:47 ^1 0/0 .>. 48:53 ^2 0/0 .>. 54:59 ^3 0/0 .>. 60:65 ^4 0/0 .>. 66:71 ^5 0/0 .>. 72:77 ^0 0/0 .>. 78:83 ^1 0/0 .>. 84:89 ^2 0/0 .>. 90:95 ^3 0/0 .>. 96:101 ^4 0/0 .>. 102:107 ^5 0/0 .>. 108:113 ^0 0/0 .>. 114:119 ^1 0/0 .>. 120:125 ^2 0/0 .>. 126:127 ^3
    rcu_bh:
    c=-226 g=-226 s=1 jfq=-5701 j=72c7 nfqs=88/nfqsng=0(88) fqlh=0 oqlen=0
    -0/1 0:127 ^0
    -0/3 0:35 ^0 0/0 36:71 ^1 0/0 72:107 ^2 0/0 108:127 ^3
    -0/3f 0:5 ^0 0/3 6:11 ^1 0/0 12:17 ^2 0/0 18:23 ^3 0/0 24:29 ^4 0/0 30:35 ^5 0/0 36:41 ^0 0/0 42:47 ^1 0/0 48:53 ^2 0/0 54:59 ^3 0/0 60:65 ^4 0/0 66:71 ^5 0/0 72:77 ^0 0/0 78:83 ^1 0/0 84:89 ^2 0/0 90:95 ^3 0/0 96:101 ^4 0/0 102:107 ^5 0/0 108:113 ^0 0/0 114:119 ^1 0/0 120:125 ^2 0/0 126:127 ^3
    +0/1 .>. 0:127 ^0
    +0/3 .>. 0:35 ^0 0/0 .>. 36:71 ^1 0/0 .>. 72:107 ^2 0/0 .>. 108:127 ^3
    +0/3f .>. 0:5 ^0 0/3 .>. 6:11 ^1 0/0 .>. 12:17 ^2 0/0 .>. 18:23 ^3 0/0 .>. 24:29 ^4 0/0 .>. 30:35 ^5 0/0 .>. 36:41 ^0 0/0 .>. 42:47 ^1 0/0 .>. 48:53 ^2 0/0 .>. 54:59 ^3 0/0 .>. 60:65 ^4 0/0 .>. 66:71 ^5 0/0 .>. 72:77 ^0 0/0 .>. 78:83 ^1 0/0 .>. 84:89 ^2 0/0 .>. 90:95 ^3 0/0 .>. 96:101 ^4 0/0 .>. 102:107 ^5 0/0 .>. 108:113 ^0 0/0 .>. 114:119 ^1 0/0 .>. 120:125 ^2 0/0 .>. 126:127 ^3

    This is once again split into "rcu_sched" and "rcu_bh" portions,
    and CONFIG_TREE_PREEMPT_RCU kernels will again have an additional
    @@ -228,6 +228,15 @@ o Each element of the form "1/1 0:127 ^0" represents one struct
    are still waiting for CPUs 2 and 4 to check in for the
    current grace period.

    + o The characters separated by the ">" indicate the state
    + of the blocked-tasks lists. A "T" preceding the ">"
    + indicates that at least one task blocked in an RCU
    + read-side critical section blocks the current grace
    + period, while a "." preceding the ">" indicates otherwise.
    + The character following the ">" indicates similarly for
    + the next grace period. A "T" should appear in this
    + field only for rcu-preempt.
    +
    o The numbers separated by the ":" are the range of CPUs
    served by this struct rcu_node. This can be helpful
    in working out how the hierarchy is wired together.
    --
    1.5.2.5


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