From: Masami Hiramatsu <mhiramat@kernel.org>
To: peterz@infradead.org
Cc: Ingo Molnar <mingo@kernel.org>,
linux-kernel@vger.kernel.org, Eddy_Wu@trendmicro.com,
x86@kernel.org, davem@davemloft.net, rostedt@goodmis.org,
naveen.n.rao@linux.ibm.com, anil.s.keshavamurthy@intel.com,
linux-arch@vger.kernel.org, cameron@moodycamel.com,
oleg@redhat.com, will@kernel.org, paulmck@kernel.org
Subject: Re: [PATCH v5 00/21] kprobes: Unify kretprobe trampoline handlers and make kretprobe lockless
Date: Fri, 11 Sep 2020 11:32:21 +0900 [thread overview]
Message-ID: <20200911113221.97c92a356d4b9090106b512b@kernel.org> (raw)
In-Reply-To: <20200902070226.GG2674@hirez.programming.kicks-ass.net>
Hi Peter and Ingo,
On Wed, 2 Sep 2020 09:02:26 +0200
peterz@infradead.org wrote:
> On Wed, Sep 02, 2020 at 09:37:39AM +0900, Masami Hiramatsu wrote:
> > On Tue, 1 Sep 2020 21:08:08 +0200
> > Peter Zijlstra <peterz@infradead.org> wrote:
> >
> > > On Sat, Aug 29, 2020 at 09:59:49PM +0900, Masami Hiramatsu wrote:
> > > > Masami Hiramatsu (16):
> > > > kprobes: Add generic kretprobe trampoline handler
> > > > x86/kprobes: Use generic kretprobe trampoline handler
> > > > arm: kprobes: Use generic kretprobe trampoline handler
> > > > arm64: kprobes: Use generic kretprobe trampoline handler
> > > > arc: kprobes: Use generic kretprobe trampoline handler
> > > > csky: kprobes: Use generic kretprobe trampoline handler
> > > > ia64: kprobes: Use generic kretprobe trampoline handler
> > > > mips: kprobes: Use generic kretprobe trampoline handler
> > > > parisc: kprobes: Use generic kretprobe trampoline handler
> > > > powerpc: kprobes: Use generic kretprobe trampoline handler
> > > > s390: kprobes: Use generic kretprobe trampoline handler
> > > > sh: kprobes: Use generic kretprobe trampoline handler
> > > > sparc: kprobes: Use generic kretprobe trampoline handler
> > > > kprobes: Remove NMI context check
> > > > kprobes: Free kretprobe_instance with rcu callback
> > > > kprobes: Make local used functions static
> > > >
> > > > Peter Zijlstra (5):
> > > > llist: Add nonatomic __llist_add() and __llist_dell_all()
> > > > kprobes: Remove kretprobe hash
> > > > asm-generic/atomic: Add try_cmpxchg() fallbacks
> > > > freelist: Lock less freelist
> > > > kprobes: Replace rp->free_instance with freelist
> > >
> > > This looks good to me, do you want me to merge them through -tip? If so,
> > > do we want to try and get them in this release still?
> >
> > Yes, thanks. For the kretprobe missing issue, we will need the first half
> > (up to "kprobes: Remove NMI context check"), so we can split the series
> > if someone think the lockless is still immature.
>
> Ok, but then lockdep will yell at you if you have that enabled and run
> the unoptimized things.
>
> > > Ingo, opinions? This basically fixes a regression cauesd by
> > >
> > > 0d00449c7a28 ("x86: Replace ist_enter() with nmi_enter()")
So what would you think of this? I saw the unification part of this series
on the tip/master, but lockless part is not there. This might still keep
lockdep to warn on kretprobes if we disable CONFIG_FUNCTION_TRACER and
optprobe.
If we make the kretprobe lockless, we will remove all locks from in-kernel
kprobe handlers. So at least upstream user will be happy.
Or, do we fix lockdep warning on the spinlocks in kprobe handlers first?
Thank you,
--
Masami Hiramatsu <mhiramat@kernel.org>
prev parent reply other threads:[~2020-09-11 2:32 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-29 12:59 [PATCH v5 00/21] kprobes: Unify kretprobe trampoline handlers and make kretprobe lockless Masami Hiramatsu
2020-08-29 13:00 ` [PATCH v5 01/21] kprobes: Add generic kretprobe trampoline handler Masami Hiramatsu
2020-08-29 13:00 ` [PATCH v5 02/21] x86/kprobes: Use " Masami Hiramatsu
2020-08-29 13:00 ` [PATCH v5 03/21] arm: kprobes: " Masami Hiramatsu
2020-08-29 13:00 ` [PATCH v5 04/21] arm64: " Masami Hiramatsu
2020-08-29 13:00 ` [PATCH v5 05/21] arc: " Masami Hiramatsu
2020-08-29 13:00 ` [PATCH v5 06/21] csky: " Masami Hiramatsu
2020-08-29 13:01 ` [PATCH v5 07/21] ia64: " Masami Hiramatsu
2020-08-29 13:01 ` [PATCH v5 08/21] mips: " Masami Hiramatsu
2020-08-29 13:01 ` [PATCH v5 09/21] parisc: " Masami Hiramatsu
2020-08-29 13:01 ` [PATCH v5 10/21] powerpc: " Masami Hiramatsu
2020-08-29 13:02 ` [PATCH v5 11/21] s390: " Masami Hiramatsu
2020-08-29 13:02 ` [PATCH v5 12/21] sh: " Masami Hiramatsu
2020-08-29 13:02 ` [PATCH v5 13/21] sparc: " Masami Hiramatsu
2020-08-29 13:02 ` [PATCH v5 14/21] kprobes: Remove NMI context check Masami Hiramatsu
[not found] ` <20201030213831.04e81962@oasis.local.home>
2020-11-02 5:11 ` Masami Hiramatsu
2020-11-02 5:53 ` Masami Hiramatsu
2020-11-02 7:02 ` Masami Hiramatsu
2020-11-02 14:27 ` Steven Rostedt
2020-11-03 5:39 ` Masami Hiramatsu
2020-11-03 16:09 ` Steven Rostedt
2020-11-04 2:08 ` Masami Hiramatsu
2020-11-04 14:47 ` Steven Rostedt
2020-11-05 5:15 ` Masami Hiramatsu
2020-08-29 13:02 ` [PATCH v5 15/21] kprobes: Free kretprobe_instance with rcu callback Masami Hiramatsu
2020-08-29 13:03 ` [PATCH v5 16/21] kprobes: Make local used functions static Masami Hiramatsu
2020-08-29 13:03 ` [PATCH v5 17/21] llist: Add nonatomic __llist_add() and __llist_dell_all() Masami Hiramatsu
2020-10-12 16:24 ` Ingo Molnar
2020-10-14 0:24 ` Masami Hiramatsu
2020-08-29 13:03 ` [PATCH v5 18/21] kprobes: Remove kretprobe hash Masami Hiramatsu
2020-08-29 13:03 ` [PATCH v5 19/21] asm-generic/atomic: Add try_cmpxchg() fallbacks Masami Hiramatsu
2020-10-12 16:25 ` Ingo Molnar
2020-08-29 13:03 ` [PATCH v5 20/21] freelist: Lock less freelist Masami Hiramatsu
2020-08-29 13:03 ` [PATCH v5 21/21] kprobes: Replace rp->free_instance with freelist Masami Hiramatsu
2020-09-01 19:08 ` [PATCH v5 00/21] kprobes: Unify kretprobe trampoline handlers and make kretprobe lockless Peter Zijlstra
2020-09-02 0:37 ` Masami Hiramatsu
2020-09-02 7:02 ` peterz
2020-09-02 8:17 ` Masami Hiramatsu
2020-09-02 9:36 ` peterz
2020-09-02 13:19 ` Masami Hiramatsu
2020-09-02 13:42 ` peterz
2020-09-03 1:39 ` Masami Hiramatsu
2020-09-03 2:02 ` Masami Hiramatsu
2020-09-07 17:44 ` Frank Ch. Eigler
2020-09-08 2:55 ` Masami Hiramatsu
2020-09-08 10:37 ` peterz
2020-09-08 11:15 ` Eddy_Wu
2020-09-08 11:33 ` peterz
2020-09-08 15:09 ` Masami Hiramatsu
2020-09-09 5:28 ` Masami Hiramatsu
2020-09-11 2:32 ` Masami Hiramatsu [this message]
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