public inbox for systemtap@sourceware.org
 help / color / mirror / Atom feed
From: Jey Jay <rjayavrp2@gmail.com>
To: systemtap@sourceware.org
Subject: maxactive(NNNN) usage
Date: Fri, 27 Dec 2013 08:33:00 -0000	[thread overview]
Message-ID: <CAAKGpwT0Hk_7XNY8t49f_qzrXGzTcP51kD4QN--=qKj4jTaGrA@mail.gmail.com> (raw)

All,

Greetings,

Below is a sample script(maxactive not included).
===================================

probe kernel.function("vfs_read").call {
            printf("hai: %d\t", bytes_read)
}
probe kernel.function("vfs_read").return {
            printf("Testing.... Jay")
}

$/bin/staprun  maxactive05.ko -c 'ls'

----- probe hit report:
kernel.function("vfs_read@fs/read_write.c:353").call,
(maxactive05.stp:6:1), hits: 18, cycles: 0min/0avg/0max, from:
kernel.function("vfs_read").call, index: 0
WARNING: Skipped due to missed kretprobe/1 on
'kernel.function("vfs_read@fs/read_write.c:353").return': 3
WARNING: Number of errors: 0, skipped probes: 3

Below is a sample script(maxactive included).
=================================

probe kernel.function("vfs_read").call {
            printf("hai: %d\t", bytes_read)
}
probe kernel.function("vfs_read").return.maxactive(1000) {
            printf("Testing.... Jay")
}

$/bin/staprun  maxactive05.ko -c 'ls'

Note: It prints hai: 0 16 times.

----- probe hit report:
kernel.function("vfs_read@fs/read_write.c:353").call,
(maxactive05.stp:6:1), hits: 18, cycles: 0min/0avg/0max, from:
kernel.function("vfs_read").call, index: 0

But there is no response for .return. i.e I'm expecting
printf("Testing.... Jay") statement to be executed. Any guidance will
help me lot..

Thanks in advance.

Regards
Jeyaram

             reply	other threads:[~2013-12-27  8:33 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-12-27  8:33 Jey Jay [this message]
2014-01-06 16:46 ` Frank Ch. Eigler
2014-01-07  0:45   ` Jey Jay

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAAKGpwT0Hk_7XNY8t49f_qzrXGzTcP51kD4QN--=qKj4jTaGrA@mail.gmail.com' \
    --to=rjayavrp2@gmail.com \
    --cc=systemtap@sourceware.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).