Re: how to avoid lost trace records?

[Olaf Hering <olaf@aepfle.de>]

On Fri, Nov 19, Olaf Hering wrote:

> Today I inspected the xenalyze and the dump-raw output and noticed that
> huge number of lost trace records, even when booted with tbuf_size=200:

Adding some silly debug to insert_lost_records() to record the count of
the individual lost events shows lots of hypercall and stuff.
However, its odd that 20f101 gets past the 10f000 tb_event_mask in
__trace_var().

                 array index, cpu, event, number
(XEN) tb_control tb_event_mask 10f000
(XEN) trace.c:256:d0 tb_set_size from 239 to 20 not implemented
(XEN) insert_lost_records #0 c 2 e 20f101 n 7545b
(XEN) insert_lost_records #1 c 2 e 20f104 n 22de8
(XEN) insert_lost_records #2 c 2 e 21211 n 169e
(XEN) insert_lost_records #3 c 2 e 28004 n 16f2
(XEN) insert_lost_records #4 c 2 e 28006 n 183a
(XEN) insert_lost_records #5 c 2 e 2800e n 2fdb
(XEN) insert_lost_records #6 c 2 e 2800f n 2fdb
(XEN) insert_lost_records #7 c 2 e 2800a n 2fdb
(XEN) insert_lost_records #8 c 2 e 21021 n 17f2
(XEN) insert_lost_records #9 c 2 e 21101 n 2fdb
(XEN) insert_lost_records #10 c 2 e 21011 n 17df
(XEN) insert_lost_records #11 c 2 e 20f008 n ce
(XEN) insert_lost_records #12 c 2 e 20f103 n 717
(XEN) insert_lost_records #13 c 2 e 20f10b n 1145
(XEN) insert_lost_records #14 c 2 e 20f106 n 16f
(XEN) insert_lost_records #15 c 2 e 21002 n 97
(XEN) insert_lost_records #16 c 2 e 801001 n 5a
(XEN) insert_lost_records #17 c 2 e 802001 n 21b4
(XEN) insert_lost_records #18 c 2 e 802002 n 21b3
(XEN) insert_lost_records #19 c 2 e 21031 n a
(XEN) insert_lost_records #20 c 2 e 21311 n a
(XEN) insert_lost_records #21 c 2 e 1f004 n 1
(XEN) insert_lost_records #22 c 2 e 10f005 n 800
(XEN) insert_lost_records #23 c 2 e 10f03b n 800
(XEN) cpupool_add_domain(dom=1,pool=0) n_dom 2
(XEN) insert_lost_records #0 c 3 e 20f101 n 7c4df
(XEN) insert_lost_records #1 c 3 e 20f104 n 219b6
(XEN) insert_lost_records #2 c 3 e 20f103 n b28
(XEN) insert_lost_records #3 c 3 e 28006 n 1a31
(XEN) insert_lost_records #4 c 3 e 2800e n 33e2
(XEN) insert_lost_records #5 c 3 e 2800f n 33e2
(XEN) insert_lost_records #6 c 3 e 2800a n 33e2
(XEN) insert_lost_records #7 c 3 e 21021 n 19db
(XEN) insert_lost_records #8 c 3 e 21101 n 33e2
(XEN) insert_lost_records #9 c 3 e 802001 n 29db
(XEN) insert_lost_records #10 c 3 e 802002 n 29da
(XEN) insert_lost_records #11 c 3 e 21011 n 19f9
(XEN) insert_lost_records #12 c 3 e 21211 n 1b99
(XEN) insert_lost_records #13 c 3 e 28004 n 1de4
(XEN) insert_lost_records #14 c 3 e 20f008 n f3
(XEN) insert_lost_records #15 c 3 e 801001 n 53
(XEN) insert_lost_records #16 c 3 e 20f10b n 10d7
(XEN) insert_lost_records #17 c 3 e 21002 n ad
(XEN) insert_lost_records #18 c 3 e 21031 n e
(XEN) insert_lost_records #19 c 3 e 21311 n e
(XEN) insert_lost_records #20 c 3 e 20f106 n 28c
(XEN) insert_lost_records #21 c 3 e 1f004 n 529
(XEN) insert_lost_records #0 c 3 e 10f005 n 1c7a6
(XEN) insert_lost_records #1 c 3 e 10f03b n f1
(XEN) insert_lost_records #0 c 5 e 20f101 n 7134e
(XEN) insert_lost_records #1 c 5 e 20f104 n 23dc3
(XEN) insert_lost_records #2 c 5 e 20f103 n 62b
...