From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Jiri Olsa <olsajiri@gmail.com>
Cc: "Steven Rostedt" <rostedt@goodmis.org>,
梦龙董 <dongmenglong.8@bytedance.com>,
"Alexei Starovoitov" <alexei.starovoitov@gmail.com>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Eddy Z" <eddyz87@gmail.com>, "Song Liu" <song@kernel.org>,
"Yonghong Song" <yonghong.song@linux.dev>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@kernel.org>,
"Stanislav Fomichev" <sdf@google.com>,
"Hao Luo" <haoluo@google.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>,
"Sven Schnelle" <svens@linux.ibm.com>,
"David S. Miller" <davem@davemloft.net>,
"David Ahern" <dsahern@kernel.org>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"X86 ML" <x86@kernel.org>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Quentin Monnet" <quentin@isovalent.com>,
bpf <bpf@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>,
linux-s390 <linux-s390@vger.kernel.org>,
"Network Development" <netdev@vger.kernel.org>,
linux-trace-kernel@vger.kernel.org,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@vger.kernel.org>,
linux-stm32@st-md-mailman.stormreply.com
Subject: Re: [External] Re: [PATCH bpf-next v2 1/9] bpf: tracing: add support to record and check the accessed args
Date: Sat, 30 Mar 2024 19:34:33 -0700 [thread overview]
Message-ID: <CAEf4BzbOAwLZ9=QnMQo-W5oHxTA7nM5ERRp0Q=WihuC8b+Y1Ww@mail.gmail.com> (raw)
In-Reply-To: <ZghRXtc8ZiTOKMR3@krava>
On Sat, Mar 30, 2024 at 10:52 AM Jiri Olsa <olsajiri@gmail.com> wrote:
>
> On Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote:
> > On Fri, 29 Mar 2024 16:28:33 -0700
> > Andrii Nakryiko <andrii.nakryiko@gmail.com> wrote:
> >
> > > I thought I'll just ask instead of digging through code, sorry for
> > > being lazy :) Is there any way to pass pt_regs/ftrace_regs captured
> > > before function execution to a return probe (fexit/kretprobe)? I.e.,
> > > how hard is it to pass input function arguments to a kretprobe? That's
> > > the biggest advantage of fexit over kretprobe, and if we can make
> > > these original pt_regs/ftrace_regs available to kretprobe, then
> > > multi-kretprobe will effectively be this multi-fexit.
> >
> > This should be possible with the updates that Masami is doing with the
> > fgraph code.
>
> yes, I have bpf kprobe-multi link support for that [0] (it's on top of
> Masami's fprobe-over-fgraph changes) we discussed that in [1]
Sorry, I forgot the regs/args part, mostly remembering we discussed
session cookie ideas. Thanks for reminder!
>
> jirka
>
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data
> [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/
WARNING: multiple messages have this Message-ID (diff)
From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Jiri Olsa <olsajiri@gmail.com>
Cc: "Steven Rostedt" <rostedt@goodmis.org>,
梦龙董 <dongmenglong.8@bytedance.com>,
"Alexei Starovoitov" <alexei.starovoitov@gmail.com>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Eddy Z" <eddyz87@gmail.com>, "Song Liu" <song@kernel.org>,
"Yonghong Song" <yonghong.song@linux.dev>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@kernel.org>,
"Stanislav Fomichev" <sdf@google.com>,
"Hao Luo" <haoluo@google.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>,
"Sven Schnelle" <svens@linux.ibm.com>,
"David S. Miller" <davem@davemloft.net>,
"David Ahern" <dsahern@kernel.org>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"X86 ML" <x86@kernel.org>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Quentin Monnet" <quentin@isovalent.com>,
bpf <bpf@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>,
linux-s390 <linux-s390@vger.kernel.org>,
"Network Development" <netdev@vger.kernel.org>,
linux-trace-kernel@vger.kernel.org,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@vger.kernel.org>,
linux-stm32@st-md-mailman.stormreply.com
Subject: Re: [External] Re: [PATCH bpf-next v2 1/9] bpf: tracing: add support to record and check the accessed args
Date: Sat, 30 Mar 2024 19:34:33 -0700 [thread overview]
Message-ID: <CAEf4BzbOAwLZ9=QnMQo-W5oHxTA7nM5ERRp0Q=WihuC8b+Y1Ww@mail.gmail.com> (raw)
In-Reply-To: <ZghRXtc8ZiTOKMR3@krava>
On Sat, Mar 30, 2024 at 10:52 AM Jiri Olsa <olsajiri@gmail.com> wrote:
>
> On Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote:
> > On Fri, 29 Mar 2024 16:28:33 -0700
> > Andrii Nakryiko <andrii.nakryiko@gmail.com> wrote:
> >
> > > I thought I'll just ask instead of digging through code, sorry for
> > > being lazy :) Is there any way to pass pt_regs/ftrace_regs captured
> > > before function execution to a return probe (fexit/kretprobe)? I.e.,
> > > how hard is it to pass input function arguments to a kretprobe? That's
> > > the biggest advantage of fexit over kretprobe, and if we can make
> > > these original pt_regs/ftrace_regs available to kretprobe, then
> > > multi-kretprobe will effectively be this multi-fexit.
> >
> > This should be possible with the updates that Masami is doing with the
> > fgraph code.
>
> yes, I have bpf kprobe-multi link support for that [0] (it's on top of
> Masami's fprobe-over-fgraph changes) we discussed that in [1]
Sorry, I forgot the regs/args part, mostly remembering we discussed
session cookie ideas. Thanks for reminder!
>
> jirka
>
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data
> [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/
_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
WARNING: multiple messages have this Message-ID (diff)
From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Jiri Olsa <olsajiri@gmail.com>
Cc: "Steven Rostedt" <rostedt@goodmis.org>,
梦龙董 <dongmenglong.8@bytedance.com>,
"Alexei Starovoitov" <alexei.starovoitov@gmail.com>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Eddy Z" <eddyz87@gmail.com>, "Song Liu" <song@kernel.org>,
"Yonghong Song" <yonghong.song@linux.dev>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@kernel.org>,
"Stanislav Fomichev" <sdf@google.com>,
"Hao Luo" <haoluo@google.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>,
"Sven Schnelle" <svens@linux.ibm.com>,
"David S. Miller" <davem@davemloft.net>,
"David Ahern" <dsahern@kernel.org>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"X86 ML" <x86@kernel.org>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Quentin Monnet" <quentin@isovalent.com>,
bpf <bpf@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>,
linux-s390 <linux-s390@vger.kernel.org>,
"Network Development" <netdev@vger.kernel.org>,
linux-trace-kernel@vger.kernel.org,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@vger.kernel.org>,
linux-stm32@st-md-mailman.stormreply.com
Subject: Re: [External] Re: [PATCH bpf-next v2 1/9] bpf: tracing: add support to record and check the accessed args
Date: Sat, 30 Mar 2024 19:34:33 -0700 [thread overview]
Message-ID: <CAEf4BzbOAwLZ9=QnMQo-W5oHxTA7nM5ERRp0Q=WihuC8b+Y1Ww@mail.gmail.com> (raw)
In-Reply-To: <ZghRXtc8ZiTOKMR3@krava>
On Sat, Mar 30, 2024 at 10:52 AM Jiri Olsa <olsajiri@gmail.com> wrote:
>
> On Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote:
> > On Fri, 29 Mar 2024 16:28:33 -0700
> > Andrii Nakryiko <andrii.nakryiko@gmail.com> wrote:
> >
> > > I thought I'll just ask instead of digging through code, sorry for
> > > being lazy :) Is there any way to pass pt_regs/ftrace_regs captured
> > > before function execution to a return probe (fexit/kretprobe)? I.e.,
> > > how hard is it to pass input function arguments to a kretprobe? That's
> > > the biggest advantage of fexit over kretprobe, and if we can make
> > > these original pt_regs/ftrace_regs available to kretprobe, then
> > > multi-kretprobe will effectively be this multi-fexit.
> >
> > This should be possible with the updates that Masami is doing with the
> > fgraph code.
>
> yes, I have bpf kprobe-multi link support for that [0] (it's on top of
> Masami's fprobe-over-fgraph changes) we discussed that in [1]
Sorry, I forgot the regs/args part, mostly remembering we discussed
session cookie ideas. Thanks for reminder!
>
> jirka
>
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data
> [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Jiri Olsa <olsajiri@gmail.com>
Cc: "Steven Rostedt" <rostedt@goodmis.org>,
梦龙董 <dongmenglong.8@bytedance.com>,
"Alexei Starovoitov" <alexei.starovoitov@gmail.com>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Eddy Z" <eddyz87@gmail.com>, "Song Liu" <song@kernel.org>,
"Yonghong Song" <yonghong.song@linux.dev>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@kernel.org>,
"Stanislav Fomichev" <sdf@google.com>,
"Hao Luo" <haoluo@google.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>,
"Sven Schnelle" <svens@linux.ibm.com>,
"David S. Miller" <davem@davemloft.net>,
"David Ahern" <dsahern@kernel.org>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"X86 ML" <x86@kernel.org>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Quentin Monnet" <quentin@isovalent.com>,
bpf <bpf@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>,
linux-s390 <linux-s390@vger.kernel.org>,
"Network Development" <netdev@vger.kernel.org>,
linux-trace-kernel@vger.kernel.org,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@vger.kernel.org>,
linux-stm32@st-md-mailman.stormreply.com
Subject: Re: [External] Re: [PATCH bpf-next v2 1/9] bpf: tracing: add support to record and check the accessed args
Date: Sat, 30 Mar 2024 19:34:33 -0700 [thread overview]
Message-ID: <CAEf4BzbOAwLZ9=QnMQo-W5oHxTA7nM5ERRp0Q=WihuC8b+Y1Ww@mail.gmail.com> (raw)
Message-ID: <20240331023433.q5WRM1A_ZvD25pNSmqpKZxl2tVN4SLJ5WG1cUxb3ncc@z> (raw)
In-Reply-To: <ZghRXtc8ZiTOKMR3@krava>
On Sat, Mar 30, 2024 at 10:52 AM Jiri Olsa <olsajiri@gmail.com> wrote:
>
> On Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote:
> > On Fri, 29 Mar 2024 16:28:33 -0700
> > Andrii Nakryiko <andrii.nakryiko@gmail.com> wrote:
> >
> > > I thought I'll just ask instead of digging through code, sorry for
> > > being lazy :) Is there any way to pass pt_regs/ftrace_regs captured
> > > before function execution to a return probe (fexit/kretprobe)? I.e.,
> > > how hard is it to pass input function arguments to a kretprobe? That's
> > > the biggest advantage of fexit over kretprobe, and if we can make
> > > these original pt_regs/ftrace_regs available to kretprobe, then
> > > multi-kretprobe will effectively be this multi-fexit.
> >
> > This should be possible with the updates that Masami is doing with the
> > fgraph code.
>
> yes, I have bpf kprobe-multi link support for that [0] (it's on top of
> Masami's fprobe-over-fgraph changes) we discussed that in [1]
Sorry, I forgot the regs/args part, mostly remembering we discussed
session cookie ideas. Thanks for reminder!
>
> jirka
>
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data
> [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/
_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
WARNING: multiple messages have this Message-ID (diff)
From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Jiri Olsa <olsajiri@gmail.com>
Cc: "Steven Rostedt" <rostedt@goodmis.org>,
梦龙董 <dongmenglong.8@bytedance.com>,
"Alexei Starovoitov" <alexei.starovoitov@gmail.com>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Eddy Z" <eddyz87@gmail.com>, "Song Liu" <song@kernel.org>,
"Yonghong Song" <yonghong.song@linux.dev>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@kernel.org>,
"Stanislav Fomichev" <sdf@google.com>,
"Hao Luo" <haoluo@google.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>,
"Sven Schnelle" <svens@linux.ibm.com>,
"David S. Miller" <davem@davemloft.net>,
"David Ahern" <dsahern@kernel.org>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"X86 ML" <x86@kernel.org>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Quentin Monnet" <quentin@isovalent.com>,
bpf <bpf@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>,
linux-s390 <linux-s390@vger.kernel.org>,
"Network Development" <netdev@vger.kernel.org>,
linux-trace-kernel@vger.kernel.org,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@vger.kernel.org>,
linux-stm32@st-md-mailman.stormreply.com
Subject: Re: [External] Re: [PATCH bpf-next v2 1/9] bpf: tracing: add support to record and check the accessed args
Date: Sat, 30 Mar 2024 19:34:33 -0700 [thread overview]
Message-ID: <CAEf4BzbOAwLZ9=QnMQo-W5oHxTA7nM5ERRp0Q=WihuC8b+Y1Ww@mail.gmail.com> (raw)
Message-ID: <20240331023433.SReVLRqBKd2EeukDmBH5qwBKqMdqXdnZ2qAve-Xg7-A@z> (raw)
In-Reply-To: <ZghRXtc8ZiTOKMR3@krava>
On Sat, Mar 30, 2024 at 10:52 AM Jiri Olsa <olsajiri@gmail.com> wrote:
>
> On Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote:
> > On Fri, 29 Mar 2024 16:28:33 -0700
> > Andrii Nakryiko <andrii.nakryiko@gmail.com> wrote:
> >
> > > I thought I'll just ask instead of digging through code, sorry for
> > > being lazy :) Is there any way to pass pt_regs/ftrace_regs captured
> > > before function execution to a return probe (fexit/kretprobe)? I.e.,
> > > how hard is it to pass input function arguments to a kretprobe? That's
> > > the biggest advantage of fexit over kretprobe, and if we can make
> > > these original pt_regs/ftrace_regs available to kretprobe, then
> > > multi-kretprobe will effectively be this multi-fexit.
> >
> > This should be possible with the updates that Masami is doing with the
> > fgraph code.
>
> yes, I have bpf kprobe-multi link support for that [0] (it's on top of
> Masami's fprobe-over-fgraph changes) we discussed that in [1]
Sorry, I forgot the regs/args part, mostly remembering we discussed
session cookie ideas. Thanks for reminder!
>
> jirka
>
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data
> [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Jiri Olsa <olsajiri@gmail.com>
Cc: "Steven Rostedt" <rostedt@goodmis.org>,
梦龙董 <dongmenglong.8@bytedance.com>,
"Alexei Starovoitov" <alexei.starovoitov@gmail.com>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Eddy Z" <eddyz87@gmail.com>, "Song Liu" <song@kernel.org>,
"Yonghong Song" <yonghong.song@linux.dev>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@kernel.org>,
"Stanislav Fomichev" <sdf@google.com>,
"Hao Luo" <haoluo@google.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>,
"Sven Schnelle" <svens@linux.ibm.com>,
"David S. Miller" <davem@davemloft.net>,
"David Ahern" <dsahern@kernel.org>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"X86 ML" <x86@kernel.org>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Quentin Monnet" <quentin@isovalent.com>,
bpf <bpf@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>,
linux-s390 <linux-s390@vger.kernel.org>,
"Network Development" <netdev@vger.kernel.org>,
linux-trace-kernel@vger.kernel.org,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@vger.kernel.org>,
linux-stm32@st-md-mailman.stormreply.com
Subject: Re: [External] Re: [PATCH bpf-next v2 1/9] bpf: tracing: add support to record and check the accessed args
Date: Sat, 30 Mar 2024 19:34:33 -0700 [thread overview]
Message-ID: <CAEf4BzbOAwLZ9=QnMQo-W5oHxTA7nM5ERRp0Q=WihuC8b+Y1Ww@mail.gmail.com> (raw)
Message-ID: <20240331023433.XN3LvHBqbGEoHb5SuuRwH-k2aur9bZzvJMFpVzc4WU8@z> (raw)
In-Reply-To: <ZghRXtc8ZiTOKMR3@krava>
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset="UTF-8", Size: 32680 bytes --]
On Sat, Mar 30, 2024 at 10:52 AM Jiri Olsa <olsajiri@gmail.com> wrote:
>
> On Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote:
> > On Fri, 29 Mar 2024 16:28:33 -0700
> > Andrii Nakryiko <andrii.nakryiko@gmail.com> wrote:
> >
> > > I thought I'll just ask instead of digging through code, sorry for
> > > being lazy :) Is there any way to pass pt_regs/ftrace_regs captured
> > > before function execution to a return probe (fexit/kretprobe)? I.e.,
> > > how hard is it to pass input function arguments to a kretprobe? That's
> > > the biggest advantage of fexit over kretprobe, and if we can make
> > > these original pt_regs/ftrace_regs available to kretprobe, then
> > > multi-kretprobe will effectively be this multi-fexit.
> >
> > This should be possible with the updates that Masami is doing with the
> > fgraph code.
>
> yes, I have bpf kprobe-multi link support for that [0] (it's on top of
> Masami's fprobe-over-fgraph changes) we discussed that in [1]
Sorry, I forgot the regs/args part, mostly remembering we discussed
session cookie ideas. Thanks for reminder!
>
> jirka
>
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data
> [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/
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From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Date: Sat, 30 Mar 2024 19:34:33 -0700
Message-ID: <CAEf4BzbOAwLZ9=MQo-W5oHxTA7nM5ERRp0Q=huC8b+Y1Ww@mail.gmail.com>
Subject: Re: [External] Re: [PATCH bpf-next v2 1/9] bpf: tracing: add support
to record and check the accessed args
To: Jiri Olsa <olsajiri@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>, =TF-8?B?5qKm6b6Z6JGj?=ongmenglong.8@bytedance.com>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>, Andrii Nakryiko <andrii@kernel.org>,
Alexei Starovoitov <ast@kernel.org>, Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <martin.lau@linux.dev>, Eddy Z <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>, John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>, Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
Alexander Gordeev <agordeev@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>, "David S. Miller" <davem@davemloft.net>,
David Ahern <dsahern@kernel.org>, Dave Hansen <dave.hansen@linux.intel.com>,
X86 ML <x86@kernel.org>, Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Quentin Monnet <quentin@isovalent.com>, bpf <bpf@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>, LKML <linux-kernel@vger.kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>, linux-s390 <linux-s390@vger.kernel.org>,
Network Development <netdev@vger.kernel.org>, linux-trace-kernel@vger.kernel.org,
"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@vger.kernel.org>, linux-stm32@st-md-mailman.stormreply.com
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On Sat, Mar 30, 2024 at 10:52 AM Jiri Olsa <olsajiri@gmail.com> wrote:
>
> On Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote:
> > On Fri, 29 Mar 2024 16:28:33 -0700
> > Andrii Nakryiko <andrii.nakryiko@gmail.com> wrote:
> >
> > > I thought I'll just ask instead of digging through code, sorry for
> > > being lazy :) Is there any way to pass pt_regs/ftrace_regs captured
> > > before function execution to a return probe (fexit/kretprobe)? I.e.,
> > > how hard is it to pass input function arguments to a kretprobe? That's
> > > the biggest advantage of fexit over kretprobe, and if we can make
> > > these original pt_regs/ftrace_regs available to kretprobe, then
> > > multi-kretprobe will effectively be this multi-fexit.
> >
> > This should be possible with the updates that Masami is doing with the
> > fgraph code.
>
> yes, I have bpf kprobe-multi link support for that [0] (it's on top of
> Masami's fprobe-over-fgraph changes) we discussed that in [1]
Sorry, I forgot the regs/args part, mostly remembering we discussed
session cookie ideas. Thanks for reminder!
>
> jirka
>
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data
> [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/
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From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Date: Sat, 30 Mar 2024 19:34:33 -0700
Message-ID: <CAEf4BzbOAwLZ9=MQo-W5oHxTA7nM5ERRp0Q=huC8b+Y1Ww@mail.gmail.com>
Subject: Re: [External] Re: [PATCH bpf-next v2 1/9] bpf: tracing: add support
to record and check the accessed args
To: Jiri Olsa <olsajiri@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>, =TF-8?B?5qKm6b6Z6JGj?=ongmenglong.8@bytedance.com>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>, Andrii Nakryiko <andrii@kernel.org>,
Alexei Starovoitov <ast@kernel.org>, Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <martin.lau@linux.dev>, Eddy Z <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>, John Fastabend <john.fastabend@gmail.com>,
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On Sat, Mar 30, 2024 at 10:52 AM Jiri Olsa <olsajiri@gmail.com> wrote:
>
> On Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote:
> > On Fri, 29 Mar 2024 16:28:33 -0700
> > Andrii Nakryiko <andrii.nakryiko@gmail.com> wrote:
> >
> > > I thought I'll just ask instead of digging through code, sorry for
> > > being lazy :) Is there any way to pass pt_regs/ftrace_regs captured
> > > before function execution to a return probe (fexit/kretprobe)? I.e.,
> > > how hard is it to pass input function arguments to a kretprobe? That's
> > > the biggest advantage of fexit over kretprobe, and if we can make
> > > these original pt_regs/ftrace_regs available to kretprobe, then
> > > multi-kretprobe will effectively be this multi-fexit.
> >
> > This should be possible with the updates that Masami is doing with the
> > fgraph code.
>
> yes, I have bpf kprobe-multi link support for that [0] (it's on top of
> Masami's fprobe-over-fgraph changes) we discussed that in [1]
Sorry, I forgot the regs/args part, mostly remembering we discussed
session cookie ideas. Thanks for reminder!
>
> jirka
>
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data
> [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/
WARNING: multiple messages have this Message-ID (diff)
From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Jiri Olsa <olsajiri@gmail.com>
Cc: "Steven Rostedt" <rostedt@goodmis.org>,
梦龙董 <dongmenglong.8@bytedance.com>,
"Alexei Starovoitov" <alexei.starovoitov@gmail.com>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Eddy Z" <eddyz87@gmail.com>, "Song Liu" <song@kernel.org>,
"Yonghong Song" <yonghong.song@linux.dev>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@kernel.org>,
"Stanislav Fomichev" <sdf@google.com>,
"Hao Luo" <haoluo@google.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>,
"Sven Schnelle" <svens@linux.ibm.com>,
"David S. Miller" <davem@davemloft.net>,
"David Ahern" <dsahern@kernel.org>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"X86 ML" <x86@kernel.org>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Quentin Monnet" <quentin@isovalent.com>,
bpf <bpf@vger.kernel.org>,
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LKML <linux-kernel@vger.kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>,
linux-s390 <linux-s390@vger.kernel.org>,
"Network Development" <netdev@vger.kernel.org>,
linux-trace-kernel@vger.kernel.org,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@vger.kernel.org>,
linux-stm32@st-md-mailman.stormreply.com
Subject: Re: [External] Re: [PATCH bpf-next v2 1/9] bpf: tracing: add support to record and check the accessed args
Date: Sat, 30 Mar 2024 19:34:33 -0700 [thread overview]
Message-ID: <CAEf4BzbOAwLZ9=QnMQo-W5oHxTA7nM5ERRp0Q=WihuC8b+Y1Ww@mail.gmail.com> (raw)
Message-ID: <20240331023433.sNIDILnTX1ey1g-hwHrFtDf24RONN1HBwy3imQ-D87w@z> (raw)
In-Reply-To: <ZghRXtc8ZiTOKMR3@krava>
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On Sat, Mar 30, 2024 at 10:52 AM Jiri Olsa <olsajiri@gmail.com> wrote:
>
> On Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote:
> > On Fri, 29 Mar 2024 16:28:33 -0700
> > Andrii Nakryiko <andrii.nakryiko@gmail.com> wrote:
> >
> > > I thought I'll just ask instead of digging through code, sorry for
> > > being lazy :) Is there any way to pass pt_regs/ftrace_regs captured
> > > before function execution to a return probe (fexit/kretprobe)? I.e.,
> > > how hard is it to pass input function arguments to a kretprobe? That's
> > > the biggest advantage of fexit over kretprobe, and if we can make
> > > these original pt_regs/ftrace_regs available to kretprobe, then
> > > multi-kretprobe will effectively be this multi-fexit.
> >
> > This should be possible with the updates that Masami is doing with the
> > fgraph code.
>
> yes, I have bpf kprobe-multi link support for that [0] (it's on top of
> Masami's fprobe-over-fgraph changes) we discussed that in [1]
Sorry, I forgot the regs/args part, mostly remembering we discussed
session cookie ideas. Thanks for reminder!
>
> jirka
>
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data
> [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/
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In-Reply-To: <ZghRXtc8ZiTOKMR3@krava>
From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Date: Sat, 30 Mar 2024 19:34:33 -0700
Message-ID: <CAEf4BzbOAwLZ9=MQo-W5oHxTA7nM5ERRp0Q=huC8b+Y1Ww@mail.gmail.com>
Subject: Re: [External] Re: [PATCH bpf-next v2 1/9] bpf: tracing: add support
to record and check the accessed args
To: Jiri Olsa <olsajiri@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>, =TF-8?B?5qKm6b6Z6JGj?=ongmenglong.8@bytedance.com>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>, Andrii Nakryiko <andrii@kernel.org>,
Alexei Starovoitov <ast@kernel.org>, Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <martin.lau@linux.dev>, Eddy Z <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>, John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>, Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
Alexander Gordeev <agordeev@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>, "David S. Miller" <davem@davemloft.net>,
David Ahern <dsahern@kernel.org>, Dave Hansen <dave.hansen@linux.intel.com>,
X86 ML <x86@kernel.org>, Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Quentin Monnet <quentin@isovalent.com>, bpf <bpf@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>, LKML <linux-kernel@vger.kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>, linux-s390 <linux-s390@vger.kernel.org>,
Network Development <netdev@vger.kernel.org>, linux-trace-kernel@vger.kernel.org,
"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@vger.kernel.org>, linux-stm32@st-md-mailman.stormreply.com
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On Sat, Mar 30, 2024 at 10:52 AM Jiri Olsa <olsajiri@gmail.com> wrote:
>
> On Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote:
> > On Fri, 29 Mar 2024 16:28:33 -0700
> > Andrii Nakryiko <andrii.nakryiko@gmail.com> wrote:
> >
> > > I thought I'll just ask instead of digging through code, sorry for
> > > being lazy :) Is there any way to pass pt_regs/ftrace_regs captured
> > > before function execution to a return probe (fexit/kretprobe)? I.e.,
> > > how hard is it to pass input function arguments to a kretprobe? That's
> > > the biggest advantage of fexit over kretprobe, and if we can make
> > > these original pt_regs/ftrace_regs available to kretprobe, then
> > > multi-kretprobe will effectively be this multi-fexit.
> >
> > This should be possible with the updates that Masami is doing with the
> > fgraph code.
>
> yes, I have bpf kprobe-multi link support for that [0] (it's on top of
> Masami's fprobe-over-fgraph changes) we discussed that in [1]
Sorry, I forgot the regs/args part, mostly remembering we discussed
session cookie ideas. Thanks for reminder!
>
> jirka
>
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data
> [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/
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From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Date: Sat, 30 Mar 2024 19:34:33 -0700
Message-ID: <CAEf4BzbOAwLZ9=MQo-W5oHxTA7nM5ERRp0Q=huC8b+Y1Ww@mail.gmail.com>
Subject: Re: [External] Re: [PATCH bpf-next v2 1/9] bpf: tracing: add support
to record and check the accessed args
To: Jiri Olsa <olsajiri@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>, =TF-8?B?5qKm6b6Z6JGj?=ongmenglong.8@bytedance.com>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>, Andrii Nakryiko <andrii@kernel.org>,
Alexei Starovoitov <ast@kernel.org>, Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <martin.lau@linux.dev>, Eddy Z <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>, John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>, Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
Alexander Gordeev <agordeev@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>, "David S. Miller" <davem@davemloft.net>,
David Ahern <dsahern@kernel.org>, Dave Hansen <dave.hansen@linux.intel.com>,
X86 ML <x86@kernel.org>, Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Quentin Monnet <quentin@isovalent.com>, bpf <bpf@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>, LKML <linux-kernel@vger.kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>, linux-s390 <linux-s390@vger.kernel.org>,
Network Development <netdev@vger.kernel.org>, linux-trace-kernel@vger.kernel.org,
"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@vger.kernel.org>, linux-stm32@st-md-mailman.stormreply.com
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On Sat, Mar 30, 2024 at 10:52 AM Jiri Olsa <olsajiri@gmail.com> wrote:
>
> On Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote:
> > On Fri, 29 Mar 2024 16:28:33 -0700
> > Andrii Nakryiko <andrii.nakryiko@gmail.com> wrote:
> >
> > > I thought I'll just ask instead of digging through code, sorry for
> > > being lazy :) Is there any way to pass pt_regs/ftrace_regs captured
> > > before function execution to a return probe (fexit/kretprobe)? I.e.,
> > > how hard is it to pass input function arguments to a kretprobe? That's
> > > the biggest advantage of fexit over kretprobe, and if we can make
> > > these original pt_regs/ftrace_regs available to kretprobe, then
> > > multi-kretprobe will effectively be this multi-fexit.
> >
> > This should be possible with the updates that Masami is doing with the
> > fgraph code.
>
> yes, I have bpf kprobe-multi link support for that [0] (it's on top of
> Masami's fprobe-over-fgraph changes) we discussed that in [1]
Sorry, I forgot the regs/args part, mostly remembering we discussed
session cookie ideas. Thanks for reminder!
>
> jirka
>
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data
> [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/
[-- Attachment #2: Type: text/plain, Size: 161 bytes --]
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WARNING: multiple messages have this Message-ID (diff)
From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Jiri Olsa <olsajiri@gmail.com>
Cc: "Steven Rostedt" <rostedt@goodmis.org>,
梦龙董 <dongmenglong.8@bytedance.com>,
"Alexei Starovoitov" <alexei.starovoitov@gmail.com>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Eddy Z" <eddyz87@gmail.com>, "Song Liu" <song@kernel.org>,
"Yonghong Song" <yonghong.song@linux.dev>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@kernel.org>,
"Stanislav Fomichev" <sdf@google.com>,
"Hao Luo" <haoluo@google.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>,
"Sven Schnelle" <svens@linux.ibm.com>,
"David S. Miller" <davem@davemloft.net>,
"David Ahern" <dsahern@kernel.org>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"X86 ML" <x86@kernel.org>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Quentin Monnet" <quentin@isovalent.com>,
bpf <bpf@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>,
linux-s390 <linux-s390@vger.kernel.org>,
"Network Development" <netdev@vger.kernel.org>,
linux-trace-kernel@vger.kernel.org,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@vger.kernel.org>,
linux-stm32@st-md-mailman.stormreply.com
Subject: Re: [External] Re: [PATCH bpf-next v2 1/9] bpf: tracing: add support to record and check the accessed args
Date: Sat, 30 Mar 2024 19:34:33 -0700 [thread overview]
Message-ID: <CAEf4BzbOAwLZ9=QnMQo-W5oHxTA7nM5ERRp0Q=WihuC8b+Y1Ww@mail.gmail.com> (raw)
Message-ID: <20240331023433.WBLGQUSB4RjzQCCcMKJ3RUGoSVAJRR4chdLOgS58jm4@z> (raw)
In-Reply-To: <ZghRXtc8ZiTOKMR3@krava>
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset="UTF-8", Size: 32682 bytes --]
On Sat, Mar 30, 2024 at 10:52 AM Jiri Olsa <olsajiri@gmail.com> wrote:
>
> On Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote:
> > On Fri, 29 Mar 2024 16:28:33 -0700
> > Andrii Nakryiko <andrii.nakryiko@gmail.com> wrote:
> >
> > > I thought I'll just ask instead of digging through code, sorry for
> > > being lazy :) Is there any way to pass pt_regs/ftrace_regs captured
> > > before function execution to a return probe (fexit/kretprobe)? I.e.,
> > > how hard is it to pass input function arguments to a kretprobe? That's
> > > the biggest advantage of fexit over kretprobe, and if we can make
> > > these original pt_regs/ftrace_regs available to kretprobe, then
> > > multi-kretprobe will effectively be this multi-fexit.
> >
> > This should be possible with the updates that Masami is doing with the
> > fgraph code.
>
> yes, I have bpf kprobe-multi link support for that [0] (it's on top of
> Masami's fprobe-over-fgraph changes) we discussed that in [1]
Sorry, I forgot the regs/args part, mostly remembering we discussed
session cookie ideas. Thanks for reminder!
>
> jirka
>
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data
> [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/
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In-Reply-To: <ZghRXtc8ZiTOKMR3@krava>
From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Date: Sat, 30 Mar 2024 19:34:33 -0700
Message-ID: <CAEf4BzbOAwLZ9=MQo-W5oHxTA7nM5ERRp0Q=huC8b+Y1Ww@mail.gmail.com>
Subject: Re: [External] Re: [PATCH bpf-next v2 1/9] bpf: tracing: add support
to record and check the accessed args
To: Jiri Olsa <olsajiri@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>, =TF-8?B?5qKm6b6Z6JGj?=ongmenglong.8@bytedance.com>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>, Andrii Nakryiko <andrii@kernel.org>,
Alexei Starovoitov <ast@kernel.org>, Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <martin.lau@linux.dev>, Eddy Z <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>, John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>, Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
Alexander Gordeev <agordeev@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>, "David S. Miller" <davem@davemloft.net>,
David Ahern <dsahern@kernel.org>, Dave Hansen <dave.hansen@linux.intel.com>,
X86 ML <x86@kernel.org>, Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Quentin Monnet <quentin@isovalent.com>, bpf <bpf@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>, LKML <linux-kernel@vger.kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>, linux-s390 <linux-s390@vger.kernel.org>,
Network Development <netdev@vger.kernel.org>, linux-trace-kernel@vger.kernel.org,
"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@vger.kernel.org>, linux-stm32@st-md-mailman.stormreply.com
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On Sat, Mar 30, 2024 at 10:52 AM Jiri Olsa <olsajiri@gmail.com> wrote:
>
> On Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote:
> > On Fri, 29 Mar 2024 16:28:33 -0700
> > Andrii Nakryiko <andrii.nakryiko@gmail.com> wrote:
> >
> > > I thought I'll just ask instead of digging through code, sorry for
> > > being lazy :) Is there any way to pass pt_regs/ftrace_regs captured
> > > before function execution to a return probe (fexit/kretprobe)? I.e.,
> > > how hard is it to pass input function arguments to a kretprobe? That's
> > > the biggest advantage of fexit over kretprobe, and if we can make
> > > these original pt_regs/ftrace_regs available to kretprobe, then
> > > multi-kretprobe will effectively be this multi-fexit.
> >
> > This should be possible with the updates that Masami is doing with the
> > fgraph code.
>
> yes, I have bpf kprobe-multi link support for that [0] (it's on top of
> Masami's fprobe-over-fgraph changes) we discussed that in [1]
Sorry, I forgot the regs/args part, mostly remembering we discussed
session cookie ideas. Thanks for reminder!
>
> jirka
>
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data
> [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/
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From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Date: Sat, 30 Mar 2024 19:34:33 -0700
Message-ID: <CAEf4BzbOAwLZ9=MQo-W5oHxTA7nM5ERRp0Q=huC8b+Y1Ww@mail.gmail.com>
Subject: Re: [External] Re: [PATCH bpf-next v2 1/9] bpf: tracing: add support
to record and check the accessed args
To: Jiri Olsa <olsajiri@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>, =TF-8?B?5qKm6b6Z6JGj?=ongmenglong.8@bytedance.com>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>, Andrii Nakryiko <andrii@kernel.org>,
Alexei Starovoitov <ast@kernel.org>, Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <martin.lau@linux.dev>, Eddy Z <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>, John Fastabend <john.fastabend@gmail.com>,
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On Sat, Mar 30, 2024 at 10:52 AM Jiri Olsa <olsajiri@gmail.com> wrote:
>
> On Sat, Mar 30, 2024 at 08:27:55AM -0400, Steven Rostedt wrote:
> > On Fri, 29 Mar 2024 16:28:33 -0700
> > Andrii Nakryiko <andrii.nakryiko@gmail.com> wrote:
> >
> > > I thought I'll just ask instead of digging through code, sorry for
> > > being lazy :) Is there any way to pass pt_regs/ftrace_regs captured
> > > before function execution to a return probe (fexit/kretprobe)? I.e.,
> > > how hard is it to pass input function arguments to a kretprobe? That's
> > > the biggest advantage of fexit over kretprobe, and if we can make
> > > these original pt_regs/ftrace_regs available to kretprobe, then
> > > multi-kretprobe will effectively be this multi-fexit.
> >
> > This should be possible with the updates that Masami is doing with the
> > fgraph code.
>
> yes, I have bpf kprobe-multi link support for that [0] (it's on top of
> Masami's fprobe-over-fgraph changes) we discussed that in [1]
Sorry, I forgot the regs/args part, mostly remembering we discussed
session cookie ideas. Thanks for reminder!
>
> jirka
>
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/log/?h=bpf/session_data
> [1] https://lore.kernel.org/bpf/20240228090242.4040210-1-jolsa@kernel.org/
[-- Attachment #2: Type: text/plain, Size: 176 bytes --]
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next prev parent reply other threads:[~2024-03-31 2:34 UTC|newest]
Thread overview: 161+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-11 9:35 [PATCH bpf-next v2 0/9] bpf: make tracing program support multi-link Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-11 9:35 ` [PATCH bpf-next v2 1/9] bpf: tracing: add support to record and check the accessed args Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-12 1:46 ` Alexei Starovoitov
2024-03-12 1:46 ` Alexei Starovoitov
2024-03-12 1:46 ` Alexei Starovoitov
2024-03-12 2:01 ` [External] " 梦龙董
2024-03-12 2:01 ` 梦龙董
2024-03-12 2:01 ` 梦龙董
2024-03-12 2:09 ` Alexei Starovoitov
2024-03-12 2:09 ` Alexei Starovoitov
2024-03-12 2:09 ` Alexei Starovoitov
2024-03-12 2:42 ` 梦龙董
2024-03-12 2:42 ` 梦龙董
2024-03-12 2:42 ` 梦龙董
2024-03-12 2:49 ` 梦龙董
2024-03-12 2:49 ` 梦龙董
2024-03-12 2:49 ` 梦龙董
2024-03-12 16:42 ` Alexei Starovoitov
2024-03-12 16:42 ` Alexei Starovoitov
2024-03-12 16:42 ` Alexei Starovoitov
2024-03-13 1:53 ` 梦龙董
2024-03-13 1:53 ` 梦龙董
2024-03-13 1:53 ` 梦龙董
2024-03-14 0:25 ` Alexei Starovoitov
2024-03-14 0:25 ` Alexei Starovoitov
2024-03-14 0:25 ` Alexei Starovoitov
2024-03-14 6:27 ` Jiri Olsa
2024-03-14 6:27 ` Jiri Olsa
2024-03-14 6:27 ` Jiri Olsa
2024-03-15 8:17 ` 梦龙董
2024-03-15 8:17 ` 梦龙董
2024-03-15 8:17 ` 梦龙董
2024-03-15 8:00 ` 梦龙董
2024-03-15 8:00 ` 梦龙董
2024-03-15 8:00 ` 梦龙董
2024-03-28 14:43 ` 梦龙董
2024-03-28 14:43 ` 梦龙董
2024-03-28 14:43 ` 梦龙董
2024-03-28 15:13 ` Steven Rostedt
2024-03-28 15:13 ` Steven Rostedt
2024-03-28 15:13 ` Steven Rostedt
2024-03-28 23:17 ` Alexei Starovoitov
2024-03-28 23:17 ` Alexei Starovoitov
2024-03-28 23:17 ` Alexei Starovoitov
2024-03-30 3:36 ` 梦龙董
2024-03-30 3:36 ` 梦龙董
2024-03-30 3:36 ` 梦龙董
2024-03-29 23:28 ` Andrii Nakryiko
2024-03-29 23:28 ` Andrii Nakryiko
2024-03-29 23:28 ` Andrii Nakryiko
2024-03-29 23:28 ` Andrii Nakryiko
2024-03-29 23:28 ` Andrii Nakryiko
2024-03-29 23:28 ` Andrii Nakryiko
2024-03-29 23:28 ` Andrii Nakryiko
2024-03-29 23:28 ` Andrii Nakryiko
2024-03-29 23:28 ` Andrii Nakryiko
2024-03-30 4:16 ` 梦龙董
2024-03-30 4:16 ` 梦龙董
2024-03-30 4:16 ` 梦龙董
2024-03-30 12:27 ` Steven Rostedt
2024-03-30 12:27 ` Steven Rostedt
2024-03-30 12:27 ` Steven Rostedt
2024-03-30 17:52 ` Jiri Olsa
2024-03-30 17:52 ` Jiri Olsa
2024-03-30 17:52 ` Jiri Olsa
2024-03-31 2:34 ` Andrii Nakryiko [this message]
2024-03-31 2:34 ` Andrii Nakryiko
2024-03-31 2:34 ` Andrii Nakryiko
2024-03-31 2:34 ` Andrii Nakryiko
2024-03-31 2:34 ` Andrii Nakryiko
2024-03-31 2:34 ` Andrii Nakryiko
2024-03-31 2:34 ` Andrii Nakryiko
2024-03-31 2:34 ` Andrii Nakryiko
2024-03-30 3:18 ` 梦龙董
2024-03-30 3:18 ` 梦龙董
2024-03-30 3:18 ` 梦龙董
2024-03-30 19:37 ` Steven Rostedt
2024-03-30 19:37 ` Steven Rostedt
2024-03-30 19:37 ` Steven Rostedt
2024-04-01 2:28 ` 梦龙董
2024-04-01 2:28 ` 梦龙董
2024-04-01 2:28 ` 梦龙董
2024-04-01 15:59 ` Steven Rostedt
2024-04-01 15:59 ` Steven Rostedt
2024-04-01 15:59 ` Steven Rostedt
2024-03-11 9:35 ` [PATCH bpf-next v2 2/9] bpf: refactor the modules_array to ptr_array Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-12 1:48 ` Alexei Starovoitov
2024-03-12 1:48 ` Alexei Starovoitov
2024-03-12 1:48 ` Alexei Starovoitov
2024-03-12 1:53 ` [External] " 梦龙董
2024-03-12 1:53 ` 梦龙董
2024-03-12 1:53 ` 梦龙董
2024-03-11 9:35 ` [PATCH bpf-next v2 3/9] bpf: trampoline: introduce struct bpf_tramp_link_conn Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-11 9:35 ` [PATCH bpf-next v2 4/9] bpf: trampoline: introduce bpf_tramp_multi_link Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-11 9:35 ` [PATCH bpf-next v2 5/9] bpf: verifier: add btf to the function args of bpf_check_attach_target Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-12 1:51 ` Alexei Starovoitov
2024-03-12 1:51 ` Alexei Starovoitov
2024-03-12 1:51 ` Alexei Starovoitov
2024-03-12 3:13 ` [External] " 梦龙董
2024-03-12 3:13 ` 梦龙董
2024-03-12 3:13 ` 梦龙董
2024-03-11 9:35 ` [PATCH bpf-next v2 6/9] bpf: tracing: add multi-link support Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-11 18:59 ` kernel test robot
2024-03-11 18:59 ` kernel test robot
2024-03-11 18:59 ` kernel test robot
2024-03-11 21:36 ` kernel test robot
2024-03-11 21:36 ` kernel test robot
2024-03-11 21:36 ` kernel test robot
2024-03-11 9:35 ` [PATCH bpf-next v2 7/9] libbpf: don't free btf if program of multi-link tracing existing Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-12 1:55 ` Alexei Starovoitov
2024-03-12 1:55 ` Alexei Starovoitov
2024-03-12 1:55 ` Alexei Starovoitov
2024-03-12 2:05 ` [External] " 梦龙董
2024-03-12 2:05 ` 梦龙董
2024-03-12 2:05 ` 梦龙董
2024-03-12 2:13 ` Alexei Starovoitov
2024-03-12 2:13 ` Alexei Starovoitov
2024-03-12 2:13 ` Alexei Starovoitov
2024-03-12 2:56 ` 梦龙董
2024-03-12 2:56 ` 梦龙董
2024-03-12 2:56 ` 梦龙董
2024-03-11 9:35 ` [PATCH bpf-next v2 8/9] libbpf: add support for the multi-link of tracing Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-11 15:29 ` Quentin Monnet
2024-03-11 15:29 ` Quentin Monnet
2024-03-11 15:29 ` Quentin Monnet
2024-03-12 1:43 ` [External] " 梦龙董
2024-03-12 1:43 ` 梦龙董
2024-03-12 1:43 ` 梦龙董
2024-03-12 1:56 ` Alexei Starovoitov
2024-03-12 1:56 ` Alexei Starovoitov
2024-03-12 1:56 ` Alexei Starovoitov
2024-03-12 2:44 ` [External] " 梦龙董
2024-03-12 2:44 ` 梦龙董
2024-03-12 2:44 ` 梦龙董
2024-03-12 16:11 ` Alexei Starovoitov
2024-03-12 16:11 ` Alexei Starovoitov
2024-03-12 16:11 ` Alexei Starovoitov
2024-03-13 1:14 ` 梦龙董
2024-03-13 1:14 ` 梦龙董
2024-03-13 1:14 ` 梦龙董
2024-03-11 9:35 ` [PATCH bpf-next v2 9/9] selftests/bpf: add testcases for " Menglong Dong
2024-03-11 9:35 ` Menglong Dong
2024-03-11 9:35 ` Menglong Dong
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