From: Song Liu <songliubraving@fb.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <song@kernel.org>,
"bpf@vger.kernel.org" <bpf@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"ast@kernel.org" <ast@kernel.org>,
"daniel@iogearbox.net" <daniel@iogearbox.net>,
"andrii@kernel.org" <andrii@kernel.org>,
Kernel Team <Kernel-team@fb.com>,
"x86@kernel.org" <x86@kernel.org>
Subject: Re: [PATCH v2 bpf-next 2/7] bpf: use bytes instead of pages for bpf_jit_[charge|uncharge]_modmem
Date: Thu, 16 Dec 2021 19:45:25 +0000 [thread overview]
Message-ID: <60221F26-614D-48DA-85C5-5FF4143AF642@fb.com> (raw)
In-Reply-To: <YbmtyiGpGLug1x5u@hirez.programming.kicks-ass.net>
> On Dec 15, 2021, at 12:56 AM, Peter Zijlstra <peterz@infradead.org> wrote:
>
> On Tue, Dec 14, 2021 at 10:00:57PM -0800, Song Liu wrote:
>> From: Song Liu <songliubraving@fb.com>
>>
>> This enables sub-page memory charge and allocation.
>>
>> Signed-off-by: Song Liu <songliubraving@fb.com>
>> ---
>> include/linux/bpf.h | 4 ++--
>> kernel/bpf/core.c | 19 +++++++++----------
>> kernel/bpf/trampoline.c | 6 +++---
>> 3 files changed, 14 insertions(+), 15 deletions(-)
>>
>> diff --git a/include/linux/bpf.h b/include/linux/bpf.h
>> index 965fffaf0308..adcdda0019f1 100644
>> --- a/include/linux/bpf.h
>> +++ b/include/linux/bpf.h
>> @@ -775,8 +775,8 @@ void bpf_image_ksym_add(void *data, struct bpf_ksym *ksym);
>> void bpf_image_ksym_del(struct bpf_ksym *ksym);
>> void bpf_ksym_add(struct bpf_ksym *ksym);
>> void bpf_ksym_del(struct bpf_ksym *ksym);
>> -int bpf_jit_charge_modmem(u32 pages);
>> -void bpf_jit_uncharge_modmem(u32 pages);
>> +int bpf_jit_charge_modmem(u32 size);
>> +void bpf_jit_uncharge_modmem(u32 size);
>> bool bpf_prog_has_trampoline(const struct bpf_prog *prog);
>> #else
>> static inline int bpf_trampoline_link_prog(struct bpf_prog *prog,
>> diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
>> index de3e5bc6781f..495e3b2c36ff 100644
>> --- a/kernel/bpf/core.c
>> +++ b/kernel/bpf/core.c
>> @@ -808,7 +808,7 @@ int bpf_jit_add_poke_descriptor(struct bpf_prog *prog,
>> return slot;
>> }
>>
>> -static atomic_long_t bpf_jit_current;
>> +static atomic64_t bpf_jit_current;
>
> atomic64_t is atrocious crap on much of 32bit. I suppose it doesn't
> matter since this is slow path accounting?
Yeah, speed shouldn't matter for bpf_jit_charge|uncharge().
Thanks,
Song
next prev parent reply other threads:[~2021-12-16 19:45 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-15 6:00 [PATCH v2 bpf-next 0/7] bpf_prog_pack allocator Song Liu
2021-12-15 6:00 ` [PATCH v2 bpf-next 1/7] x86/Kconfig: select HAVE_ARCH_HUGE_VMALLOC with HAVE_ARCH_HUGE_VMAP Song Liu
2021-12-15 6:00 ` [PATCH v2 bpf-next 2/7] bpf: use bytes instead of pages for bpf_jit_[charge|uncharge]_modmem Song Liu
2021-12-15 8:56 ` Peter Zijlstra
2021-12-16 19:45 ` Song Liu [this message]
2021-12-15 6:00 ` [PATCH v2 bpf-next 3/7] bpf: use size instead of pages in bpf_binary_header Song Liu
2021-12-15 6:00 ` [PATCH v2 bpf-next 4/7] bpf: add a pointer of bpf_binary_header to bpf_prog Song Liu
2021-12-15 6:01 ` [PATCH v2 bpf-next 5/7] x86/alternative: introduce text_poke_jit Song Liu
2021-12-15 9:06 ` Peter Zijlstra
2021-12-15 9:17 ` Peter Zijlstra
2021-12-16 19:40 ` Song Liu
2021-12-15 6:01 ` [PATCH v2 bpf-next 6/7] bpf: introduce bpf_prog_pack allocator Song Liu
2021-12-15 6:01 ` [PATCH v2 bpf-next 7/7] bpf, x86_64: use " Song Liu
2021-12-16 20:06 ` [PATCH v2 bpf-next 0/7] " Andrii Nakryiko
2021-12-17 1:53 ` Song Liu
2021-12-17 16:42 ` Andrii Nakryiko
2021-12-17 16:43 ` Andrii Nakryiko
2021-12-17 17:13 ` Song Liu
2021-12-17 17:16 ` Andrii Nakryiko
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