On Tue, Apr 20, 2021 at 9:52 AM Jiri Olsa wrote:
>
> On Tue, Apr 20, 2021 at 08:33:43AM -0700, Alexei Starovoitov wrote:
> > On Tue, Apr 20, 2021 at 5:51 AM Jiri Olsa wrote:
> > >
> > > On Fri, Apr 16, 2021 at 12:48:34PM -0400, Steven Rostedt wrote:
> > > > On Sat, 17 Apr 2021 00:03:04 +0900
> >
On Tue, Apr 20, 2021 at 08:33:43AM -0700, Alexei Starovoitov wrote:
> On Tue, Apr 20, 2021 at 5:51 AM Jiri Olsa wrote:
> >
> > On Fri, Apr 16, 2021 at 12:48:34PM -0400, Steven Rostedt wrote:
> > > On Sat, 17 Apr 2021 00:03:04 +0900
> > > Masami Hiramatsu wrote:
> > >
> > > > > Anyway, IIRC, Masam
On Tue, 20 Apr 2021 08:33:43 -0700
Alexei Starovoitov wrote:
> I don't see how you can do it without BTF.
I agree.
> The mass-attach feature should prepare generic 6 or so arguments
> from all functions it attached to.
> On x86-64 it's trivial because 6 regs are the same.
> On arm64 is now mo
On Tue, Apr 20, 2021 at 5:51 AM Jiri Olsa wrote:
>
> On Fri, Apr 16, 2021 at 12:48:34PM -0400, Steven Rostedt wrote:
> > On Sat, 17 Apr 2021 00:03:04 +0900
> > Masami Hiramatsu wrote:
> >
> > > > Anyway, IIRC, Masami wasn't sure that the full regs was ever needed for
> > > > the
> > > > return (
On Fri, Apr 16, 2021 at 12:48:34PM -0400, Steven Rostedt wrote:
> On Sat, 17 Apr 2021 00:03:04 +0900
> Masami Hiramatsu wrote:
>
> > > Anyway, IIRC, Masami wasn't sure that the full regs was ever needed for
> > > the
> > > return (who cares about the registers on return, except for the return
>
On Fri, Apr 16, 2021 at 8:03 AM Masami Hiramatsu wrote:
>
> Hi,
>
> On Thu, 15 Apr 2021 17:00:07 -0400
> Steven Rostedt wrote:
>
> >
> > [
> > Added Masami, as I didn't realize he wasn't on Cc. He's the maintainer of
> > kretprobes.
> >
> > Masami, you may want to use lore.kernel.org to rea
On Mon, 19 Apr 2021 22:51:46 +0200
Jiri Olsa wrote:
> now, it looks like the fgraph_ops entry callback does not have access
> to registers.. once we have that, we could store arguments for the exit
> callback and have all in place.. could this be added? ;-)
Sure. The only problem is that we need
On Thu, Apr 15, 2021 at 07:30:32PM -0400, Steven Rostedt wrote:
> On Thu, 15 Apr 2021 23:49:43 +0200
> Jiri Olsa wrote:
>
>
> > right, I quickly checked on that and it looks exactly like
> > the thing we need
> >
> > I'll try to rebase that on the current code and try to use
> > it with the bpf
On Fri, 16 Apr 2021 12:48:34 -0400
Steven Rostedt wrote:
> On Sat, 17 Apr 2021 00:03:04 +0900
> Masami Hiramatsu wrote:
>
> > > Anyway, IIRC, Masami wasn't sure that the full regs was ever needed for
> > > the
> > > return (who cares about the registers on return, except for the return
> > > v
On Sat, 17 Apr 2021 00:03:04 +0900
Masami Hiramatsu wrote:
> > Anyway, IIRC, Masami wasn't sure that the full regs was ever needed for the
> > return (who cares about the registers on return, except for the return
> > value?)
>
> I think kretprobe and ftrace are for a bit different usage. kret
Hi,
On Thu, 15 Apr 2021 17:00:07 -0400
Steven Rostedt wrote:
>
> [
> Added Masami, as I didn't realize he wasn't on Cc. He's the maintainer of
> kretprobes.
>
> Masami, you may want to use lore.kernel.org to read the history of this
> thread.
> ]
>
> On Thu, 15 Apr 2021 13:45:06 -0700
On Thu, 15 Apr 2021 23:49:43 +0200
Jiri Olsa wrote:
> right, I quickly checked on that and it looks exactly like
> the thing we need
>
> I'll try to rebase that on the current code and try to use
> it with the bpf ftrace probe to see how it fits
>
> any chance you could plan on reposting it? ;
On Thu, Apr 15, 2021 at 02:21:20PM -0400, Steven Rostedt wrote:
> On Thu, 15 Apr 2021 14:18:31 -0400
> Steven Rostedt wrote:
>
> > My last release of that code is here:
> >
> > https://lore.kernel.org/lkml/20190525031633.811342...@goodmis.org/
> >
> > It allows you to "reserve data" to pass f
[
Added Masami, as I didn't realize he wasn't on Cc. He's the maintainer of
kretprobes.
Masami, you may want to use lore.kernel.org to read the history of this
thread.
]
On Thu, 15 Apr 2021 13:45:06 -0700
Andrii Nakryiko wrote:
> > I don't know how the BPF code does it, but if you are
On Thu, Apr 15, 2021 at 8:10 AM Steven Rostedt wrote:
>
> On Wed, 14 Apr 2021 15:46:49 -0700
> Andrii Nakryiko wrote:
>
> > On Wed, Apr 14, 2021 at 5:19 AM Jiri Olsa wrote:
> > >
> > > On Tue, Apr 13, 2021 at 06:04:05PM -0700, Andrii Nakryiko wrote:
> > > > On Tue, Apr 13, 2021 at 7:57 AM Jiri O
On 4/15/21 11:18 AM, Steven Rostedt wrote:
On Thu, 15 Apr 2021 19:39:45 +0200
Jiri Olsa wrote:
I don't know how the BPF code does it, but if you are tracing the exit
of a function, I'm assuming that you hijack the return pointer and replace
it with a call to a trampoline that has access to
On Thu, 15 Apr 2021 14:18:31 -0400
Steven Rostedt wrote:
> My last release of that code is here:
>
> https://lore.kernel.org/lkml/20190525031633.811342...@goodmis.org/
>
> It allows you to "reserve data" to pass from the caller to the return, and
> that could hold the arguments. See patch 15
On Thu, 15 Apr 2021 19:39:45 +0200
Jiri Olsa wrote:
> > I don't know how the BPF code does it, but if you are tracing the exit
> > of a function, I'm assuming that you hijack the return pointer and replace
> > it with a call to a trampoline that has access to the arguments. To do
>
> hi,
> it'
On Thu, Apr 15, 2021 at 11:10:02AM -0400, Steven Rostedt wrote:
SNIP
> > > heya,
> > > I had some initial prototypes trying this way, but always ended up
> > > in complicated code, that's why I turned to ftrace_ops.
> > >
> > > let's see if it'll make any sense to you ;-)
> > >
> > > 1) so let's
On Wed, 14 Apr 2021 15:46:49 -0700
Andrii Nakryiko wrote:
> On Wed, Apr 14, 2021 at 5:19 AM Jiri Olsa wrote:
> >
> > On Tue, Apr 13, 2021 at 06:04:05PM -0700, Andrii Nakryiko wrote:
> > > On Tue, Apr 13, 2021 at 7:57 AM Jiri Olsa wrote:
> > > >
> > > > hi,
> > > > sending another attempt on
On Wed, Apr 14, 2021 at 03:46:49PM -0700, Andrii Nakryiko wrote:
> On Wed, Apr 14, 2021 at 5:19 AM Jiri Olsa wrote:
> >
> > On Tue, Apr 13, 2021 at 06:04:05PM -0700, Andrii Nakryiko wrote:
> > > On Tue, Apr 13, 2021 at 7:57 AM Jiri Olsa wrote:
> > > >
> > > > hi,
> > > > sending another attempt o
On Wed, Apr 14, 2021 at 5:19 AM Jiri Olsa wrote:
>
> On Tue, Apr 13, 2021 at 06:04:05PM -0700, Andrii Nakryiko wrote:
> > On Tue, Apr 13, 2021 at 7:57 AM Jiri Olsa wrote:
> > >
> > > hi,
> > > sending another attempt on speeding up load of multiple probes
> > > for bpftrace and possibly other too
On Tue, Apr 13, 2021 at 06:04:05PM -0700, Andrii Nakryiko wrote:
> On Tue, Apr 13, 2021 at 7:57 AM Jiri Olsa wrote:
> >
> > hi,
> > sending another attempt on speeding up load of multiple probes
> > for bpftrace and possibly other tools (first post in [1]).
> >
> > This patchset adds support to at
On Tue, Apr 13, 2021 at 7:57 AM Jiri Olsa wrote:
>
> hi,
> sending another attempt on speeding up load of multiple probes
> for bpftrace and possibly other tools (first post in [1]).
>
> This patchset adds support to attach bpf program directly to
> ftrace probe as suggested by Steven and it speed
hi,
sending another attempt on speeding up load of multiple probes
for bpftrace and possibly other tools (first post in [1]).
This patchset adds support to attach bpf program directly to
ftrace probe as suggested by Steven and it speeds up loading
for bpftrace commands like:
# bpftrace -e 'kfu
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