lkml.org 
[lkml]   [2021]   [Dec]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2 bpf-next 2/7] bpf: use bytes instead of pages for bpf_jit_[charge|uncharge]_modmem
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?

\
 
 \ /
  Last update: 2021-12-15 09:57    [W:0.119 / U:4.528 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site