From: Steven Rostedt <rostedt@goodmis.org>
To: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>,
Anton Blanchard <anton@ozlabs.org>,
linux-kernel@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 2/2] trace/kprobe: Remove limit on kretprobe maxactive
Date: Thu, 17 Jun 2021 13:07:13 -0400 [thread overview]
Message-ID: <20210617130713.194a7152@gandalf.local.home> (raw)
In-Reply-To: <1623946796.80yhllbpmp.naveen@linux.ibm.com>
On Thu, 17 Jun 2021 22:04:34 +0530
"Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> wrote:
> > 2. Move the kretprobe instance pool from kretprobe to struct task.
> > This pool will allocates one page per task, and shared among all
> > kretprobes. This pool will be allocated when the 1st kretprobe
> > is registered. maxactive will be kept for someone who wants to
> > use per-instance data. But since dynamic event doesn't use it,
> > it will be removed from tracefs and perf.
>
> Won't this result in _more_ memory usage compared to what we have now?
Maybe or maybe not. At least with this approach (or the function graph
one), you will allocate enough for the environment involved. If there's
thousands of tasks, then yes, it will allocate more memory. But if you are
running thousands of tasks, you should have a lot of memory in the machine.
If you are only running a few tasks, it will be less than the current
approach.
-- Steve
next prev parent reply other threads:[~2021-06-17 17:07 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-14 18:03 [PATCH 0/2] trace/kprobe: Two fixes for kretprobes Naveen N. Rao
2021-06-14 18:03 ` [PATCH 1/2] trace/kprobe: Fix count of missed kretprobes in kprobe_profile Naveen N. Rao
2021-06-15 5:47 ` Masami Hiramatsu
2021-06-14 18:03 ` [PATCH 2/2] trace/kprobe: Remove limit on kretprobe maxactive Naveen N. Rao
2021-06-15 9:35 ` Masami Hiramatsu
2021-06-15 17:41 ` Naveen N. Rao
2021-06-16 0:46 ` Masami Hiramatsu
2021-06-16 1:03 ` Steven Rostedt
2021-06-16 2:27 ` Masami Hiramatsu
2021-06-16 15:10 ` Masami Hiramatsu
2021-06-17 16:34 ` Naveen N. Rao
2021-06-17 17:07 ` Steven Rostedt [this message]
2021-06-18 4:26 ` Masami Hiramatsu
2021-06-18 8:41 ` Naveen N. Rao
2021-06-17 16:19 ` Naveen N. Rao
2021-06-18 6:17 ` Masami Hiramatsu
2021-06-18 13:19 ` Naveen N. Rao
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=20210617130713.194a7152@gandalf.local.home \
--to=rostedt@goodmis.org \
--cc=anton@ozlabs.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mhiramat@kernel.org \
--cc=naveen.n.rao@linux.vnet.ibm.com \
--cc=peterz@infradead.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.