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From: Martin KaFai Lau <kafai@fb.com>
To: Song Liu <songliubraving@fb.com>
Cc: bpf <bpf@vger.kernel.org>, Networking <netdev@vger.kernel.org>,
	open list <linux-kernel@vger.kernel.org>,
	"mingo@redhat.com" <mingo@redhat.com>,
	"peterz@infradead.org" <peterz@infradead.org>,
	"ast@kernel.org" <ast@kernel.org>,
	"daniel@iogearbox.net" <daniel@iogearbox.net>,
	"andrii@kernel.org" <andrii@kernel.org>,
	"john.fastabend@gmail.com" <john.fastabend@gmail.com>,
	"kpsingh@chromium.org" <kpsingh@chromium.org>,
	Kernel Team <Kernel-team@fb.com>,
	"haoluo@google.com" <haoluo@google.com>,
	kernel test robot <lkp@intel.com>
Subject: Re: [PATCH bpf-next 1/4] bpf: enable task local storage for tracing programs
Date: Tue, 12 Jan 2021 10:21:45 -0800	[thread overview]
Message-ID: <20210112182109.ti434nov2c6dmuvn@kafai-mbp> (raw)
In-Reply-To: <4D0333B1-C729-41BF-AB1D-9AC233431094@fb.com>

On Mon, Jan 11, 2021 at 03:41:26PM -0800, Song Liu wrote:
> 
> 
> > On Jan 11, 2021, at 10:56 AM, Martin Lau <kafai@fb.com> wrote:
> > 
> > On Fri, Jan 08, 2021 at 03:19:47PM -0800, Song Liu wrote:
> > 
> > [ ... ]
> > 
> >> diff --git a/kernel/bpf/bpf_local_storage.c b/kernel/bpf/bpf_local_storage.c
> >> index dd5aedee99e73..9bd47ad2b26f1 100644
> >> --- a/kernel/bpf/bpf_local_storage.c
> >> +++ b/kernel/bpf/bpf_local_storage.c
> >> @@ -140,17 +140,18 @@ static void __bpf_selem_unlink_storage(struct bpf_local_storage_elem *selem)
> >> {
> >> 	struct bpf_local_storage *local_storage;
> >> 	bool free_local_storage = false;
> >> +	unsigned long flags;
> >> 
> >> 	if (unlikely(!selem_linked_to_storage(selem)))
> >> 		/* selem has already been unlinked from sk */
> >> 		return;
> >> 
> >> 	local_storage = rcu_dereference(selem->local_storage);
> >> -	raw_spin_lock_bh(&local_storage->lock);
> >> +	raw_spin_lock_irqsave(&local_storage->lock, flags);
> > It will be useful to have a few words in commit message on this change
> > for future reference purpose.
> > 
> > Please also remove the in_irq() check from bpf_sk_storage.c
> > to avoid confusion in the future.  It probably should
> > be in a separate patch.
> 
> Do you mean we allow bpf_sk_storage_get_tracing() and 
> bpf_sk_storage_delete_tracing() in irq context? Like
Right.

However, after another thought, may be lets skip that for now
till a use case comes up and a test can be written.

  reply	other threads:[~2021-01-12 18:23 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20210108231950.3844417-1-songliubraving@fb.com>
     [not found] ` <20210108231950.3844417-2-songliubraving@fb.com>
2021-01-11  6:27   ` [PATCH bpf-next 1/4] bpf: enable task local storage for tracing programs Yonghong Song
2021-01-11 10:17     ` KP Singh
2021-01-11 15:56       ` Yonghong Song
2021-01-11 10:14   ` KP Singh
2021-01-11 23:16     ` Song Liu
2021-01-11 17:16   ` Yonghong Song
2021-01-11 18:56   ` Martin KaFai Lau
2021-01-11 21:35     ` KP Singh
2021-01-11 21:58       ` Martin KaFai Lau
2021-01-11 23:45         ` Song Liu
2021-01-12 16:32           ` Yonghong Song
2021-01-12 16:53             ` KP Singh
2021-01-15 23:34               ` Song Liu
2021-01-16  0:55                 ` Yonghong Song
2021-01-16  1:12                   ` Song Liu
2021-01-16  1:50                     ` Yonghong Song
2021-01-11 23:41     ` Song Liu
2021-01-12 18:21       ` Martin KaFai Lau [this message]
     [not found] ` <20210108231950.3844417-4-songliubraving@fb.com>
2021-01-11 17:37   ` [PATCH bpf-next 3/4] bpf: runqslower: prefer use local vmlinux Yonghong Song
     [not found] ` <20210108231950.3844417-5-songliubraving@fb.com>
2021-01-11 17:49   ` [PATCH bpf-next 4/4] bpf: runqslower: use task local storage Yonghong Song
2021-01-11 22:54     ` Song Liu
2021-01-12  3:24       ` Yonghong Song
2021-01-12  7:14         ` Andrii Nakryiko
2021-01-12  7:33           ` Yonghong Song
     [not found] ` <20210108231950.3844417-3-songliubraving@fb.com>
2021-01-11 17:30   ` [PATCH bpf-next 2/4] selftests/bpf: add non-BPF_LSM test for " Yonghong Song
2021-01-11 17:44     ` KP Singh
2021-01-11 22:50       ` Song Liu
2021-01-11 22:49     ` Song Liu
2021-01-12  7:06   ` Andrii Nakryiko

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