lkml.org 
[lkml]   [2009]   [Apr]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 3/3] v2 Update RCU tracing documentation for __rcu_pending
    Date
    From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

    This patch updates the RCU documentation to reflect the changes in
    tracing made in the previous patch in the set.

    Located-by: Anton Blanchard <anton@au1.ibm.com>
    Tested-by: Anton Blanchard <anton@au1.ibm.com>
    Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
    ---
    Documentation/RCU/trace.txt | 102 +++++++++++++++++++++++++++++++++---------
    1 files changed, 80 insertions(+), 22 deletions(-)

    diff --git a/Documentation/RCU/trace.txt b/Documentation/RCU/trace.txt
    index 0688482..02cced1 100644
    --- a/Documentation/RCU/trace.txt
    +++ b/Documentation/RCU/trace.txt
    @@ -192,23 +192,24 @@ rcu/rcuhier (which displays the struct rcu_node hierarchy).
    The output of "cat rcu/rcudata" looks as follows:

    rcu:
    - 0 c=4011 g=4012 pq=1 pqc=4011 qp=0 rpfq=1 rp=3c2a dt=23301/73 dn=2 df=1882 of=0 ri=2126 ql=2 b=10
    - 1 c=4011 g=4012 pq=1 pqc=4011 qp=0 rpfq=3 rp=39a6 dt=78073/1 dn=2 df=1402 of=0 ri=1875 ql=46 b=10
    - 2 c=4010 g=4010 pq=1 pqc=4010 qp=0 rpfq=-5 rp=1d12 dt=16646/0 dn=2 df=3140 of=0 ri=2080 ql=0 b=10
    - 3 c=4012 g=4013 pq=1 pqc=4012 qp=1 rpfq=3 rp=2b50 dt=21159/1 dn=2 df=2230 of=0 ri=1923 ql=72 b=10
    - 4 c=4012 g=4013 pq=1 pqc=4012 qp=1 rpfq=3 rp=1644 dt=5783/1 dn=2 df=3348 of=0 ri=2805 ql=7 b=10
    - 5 c=4012 g=4013 pq=0 pqc=4011 qp=1 rpfq=3 rp=1aac dt=5879/1 dn=2 df=3140 of=0 ri=2066 ql=10 b=10
    - 6 c=4012 g=4013 pq=1 pqc=4012 qp=1 rpfq=3 rp=ed8 dt=5847/1 dn=2 df=3797 of=0 ri=1266 ql=10 b=10
    - 7 c=4012 g=4013 pq=1 pqc=4012 qp=1 rpfq=3 rp=1fa2 dt=6199/1 dn=2 df=2795 of=0 ri=2162 ql=28 b=10
    +rcu:
    + 0 c=17829 g=17829 pq=1 pqc=17829 qp=0 dt=10951/1 dn=0 df=1101 of=0 ri=36 ql=0 b=10
    + 1 c=17829 g=17829 pq=1 pqc=17829 qp=0 dt=16117/1 dn=0 df=1015 of=0 ri=0 ql=0 b=10
    + 2 c=17829 g=17829 pq=1 pqc=17829 qp=0 dt=1445/1 dn=0 df=1839 of=0 ri=0 ql=0 b=10
    + 3 c=17829 g=17829 pq=1 pqc=17829 qp=0 dt=6681/1 dn=0 df=1545 of=0 ri=0 ql=0 b=10
    + 4 c=17829 g=17829 pq=1 pqc=17829 qp=0 dt=1003/1 dn=0 df=1992 of=0 ri=0 ql=0 b=10
    + 5 c=17829 g=17830 pq=1 pqc=17829 qp=1 dt=3887/1 dn=0 df=3331 of=0 ri=4 ql=2 b=10
    + 6 c=17829 g=17829 pq=1 pqc=17829 qp=0 dt=859/1 dn=0 df=3224 of=0 ri=0 ql=0 b=10
    + 7 c=17829 g=17830 pq=0 pqc=17829 qp=1 dt=3761/1 dn=0 df=1818 of=0 ri=0 ql=2 b=10
    rcu_bh:
    - 0 c=-268 g=-268 pq=1 pqc=-268 qp=0 rpfq=-145 rp=21d6 dt=23301/73 dn=2 df=0 of=0 ri=0 ql=0 b=10
    - 1 c=-268 g=-268 pq=1 pqc=-268 qp=1 rpfq=-170 rp=20ce dt=78073/1 dn=2 df=26 of=0 ri=5 ql=0 b=10
    - 2 c=-268 g=-268 pq=1 pqc=-268 qp=1 rpfq=-83 rp=fbd dt=16646/0 dn=2 df=28 of=0 ri=4 ql=0 b=10
    - 3 c=-268 g=-268 pq=1 pqc=-268 qp=0 rpfq=-105 rp=178c dt=21159/1 dn=2 df=28 of=0 ri=2 ql=0 b=10
    - 4 c=-268 g=-268 pq=1 pqc=-268 qp=1 rpfq=-30 rp=b54 dt=5783/1 dn=2 df=32 of=0 ri=0 ql=0 b=10
    - 5 c=-268 g=-268 pq=1 pqc=-268 qp=1 rpfq=-29 rp=df5 dt=5879/1 dn=2 df=30 of=0 ri=3 ql=0 b=10
    - 6 c=-268 g=-268 pq=1 pqc=-268 qp=1 rpfq=-28 rp=788 dt=5847/1 dn=2 df=32 of=0 ri=0 ql=0 b=10
    - 7 c=-268 g=-268 pq=1 pqc=-268 qp=1 rpfq=-53 rp=1098 dt=6199/1 dn=2 df=30 of=0 ri=3 ql=0 b=10
    + 0 c=-275 g=-275 pq=1 pqc=-275 qp=0 dt=10951/1 dn=0 df=0 of=0 ri=0 ql=0 b=10
    + 1 c=-275 g=-275 pq=1 pqc=-275 qp=0 dt=16117/1 dn=0 df=13 of=0 ri=0 ql=0 b=10
    + 2 c=-275 g=-275 pq=1 pqc=-275 qp=0 dt=1445/1 dn=0 df=15 of=0 ri=0 ql=0 b=10
    + 3 c=-275 g=-275 pq=1 pqc=-275 qp=0 dt=6681/1 dn=0 df=9 of=0 ri=0 ql=0 b=10
    + 4 c=-275 g=-275 pq=1 pqc=-275 qp=0 dt=1003/1 dn=0 df=15 of=0 ri=0 ql=0 b=10
    + 5 c=-275 g=-275 pq=1 pqc=-275 qp=0 dt=3887/1 dn=0 df=15 of=0 ri=0 ql=0 b=10
    + 6 c=-275 g=-275 pq=1 pqc=-275 qp=0 dt=859/1 dn=0 df=15 of=0 ri=0 ql=0 b=10
    + 7 c=-275 g=-275 pq=1 pqc=-275 qp=0 dt=3761/1 dn=0 df=15 of=0 ri=0 ql=0 b=10

    The first section lists the rcu_data structures for rcu, the second for
    rcu_bh. Each section has one line per CPU, or eight for this 8-CPU system.
    @@ -253,12 +254,6 @@ o "pqc" indicates which grace period the last-observed quiescent
    o "qp" indicates that RCU still expects a quiescent state from
    this CPU.

    -o "rpfq" is the number of rcu_pending() calls on this CPU required
    - to induce this CPU to invoke force_quiescent_state().
    -
    -o "rp" is low-order four hex digits of the count of how many times
    - rcu_pending() has been invoked on this CPU.
    -
    o "dt" is the current value of the dyntick counter that is incremented
    when entering or leaving dynticks idle state, either by the
    scheduler or by irq. The number after the "/" is the interrupt
    @@ -305,6 +300,9 @@ o "b" is the batch limit for this CPU. If more than this number
    of RCU callbacks is ready to invoke, then the remainder will
    be deferred.

    +There is also an rcu/rcudata.csv file with the same information in
    +comma-separated-variable spreadsheet format.
    +

    The output of "cat rcu/rcugp" looks as follows:

    @@ -411,3 +409,63 @@ o Each element of the form "1/1 0:127 ^0" represents one struct
    For example, the first entry at the lowest level shows
    "^0", indicating that it corresponds to bit zero in
    the first entry at the middle level.
    +
    +
    +The output of "cat rcu/rcu_pending" looks as follows:
    +
    +rcu:
    + 0 np=255892 qsp=53936 cbr=0 cng=14417 gpc=10033 gps=24320 nf=6445 nn=146741
    + 1 np=261224 qsp=54638 cbr=0 cng=25723 gpc=16310 gps=2849 nf=5912 nn=155792
    + 2 np=237496 qsp=49664 cbr=0 cng=2762 gpc=45478 gps=1762 nf=1201 nn=136629
    + 3 np=236249 qsp=48766 cbr=0 cng=286 gpc=48049 gps=1218 nf=207 nn=137723
    + 4 np=221310 qsp=46850 cbr=0 cng=26 gpc=43161 gps=4634 nf=3529 nn=123110
    + 5 np=237332 qsp=48449 cbr=0 cng=54 gpc=47920 gps=3252 nf=201 nn=137456
    + 6 np=219995 qsp=46718 cbr=0 cng=50 gpc=42098 gps=6093 nf=4202 nn=120834
    + 7 np=249893 qsp=49390 cbr=0 cng=72 gpc=38400 gps=17102 nf=41 nn=144888
    +rcu_bh:
    + 0 np=146741 qsp=1419 cbr=0 cng=6 gpc=0 gps=0 nf=2 nn=145314
    + 1 np=155792 qsp=12597 cbr=0 cng=0 gpc=4 gps=8 nf=3 nn=143180
    + 2 np=136629 qsp=18680 cbr=0 cng=0 gpc=7 gps=6 nf=0 nn=117936
    + 3 np=137723 qsp=2843 cbr=0 cng=0 gpc=10 gps=7 nf=0 nn=134863
    + 4 np=123110 qsp=12433 cbr=0 cng=0 gpc=4 gps=2 nf=0 nn=110671
    + 5 np=137456 qsp=4210 cbr=0 cng=0 gpc=6 gps=5 nf=0 nn=133235
    + 6 np=120834 qsp=9902 cbr=0 cng=0 gpc=6 gps=3 nf=2 nn=110921
    + 7 np=144888 qsp=26336 cbr=0 cng=0 gpc=8 gps=2 nf=0 nn=118542
    +
    +As always, this is once again split into "rcu" and "rcu_bh" portions.
    +The fields are as follows:
    +
    +o "np" is the number of times that __rcu_pending() has been invoked
    + for the corresponding flavor of RCU.
    +
    +o "qsp" is the number of times that the RCU was waiting for a
    + quiescent state from this CPU.
    +
    +o "cbr" is the number of times that this CPU had RCU callbacks
    + that had passed through a grace period, and were thus ready
    + to be invoked.
    +
    +o "cng" is the number of times that this CPU needed another
    + grace period while RCU was idle.
    +
    +o "gpc" is the number of times that an old grace period had
    + completed, but this CPU was not yet aware of it.
    +
    +o "gps" is the number of times that a new grace period had started,
    + but this CPU was not yet aware of it.
    +
    +o "nf" is the number of times that this CPU suspected that the
    + current grace period had run for too long, and thus needed to
    + be forced.
    +
    + Please note that "forcing" consists of sending resched IPIs
    + to holdout CPUs. If that CPU really still is in an old RCU
    + read-side critical section, then we really do have to wait for it.
    + The assumption behing "forcing" is that the CPU is not still in
    + an old RCU read-side critical section, but has not yet responded
    + for some other reason.
    +
    +o "nn" is the number of times that this CPU needed nothing. Alert
    + readers will note that the rcu "nn" number for a given CPU very
    + closely matches the rcu_bh "np" number for that same CPU. This
    + is due to short-circuit evaluation in rcu_pending().
    --
    1.5.2.5


    \
     
     \ /
      Last update: 2009-04-14 07:05    [W:0.032 / U:0.076 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site