From: Christian Brauner <brauner@kernel.org>
To: Jens Axboe <axboe@kernel.dk>
Cc: io-uring@vger.kernel.org, jannh@google.com, kees@kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 4/7] io_uring/bpf_filter: cache lookup table in ctx->bpf_filters
Date: Tue, 27 Jan 2026 10:33:46 +0100 [thread overview]
Message-ID: <20260127-akrobatisch-couch-5bba9980d78e@brauner> (raw)
In-Reply-To: <20260119235456.1722452-5-axboe@kernel.dk>
On Mon, Jan 19, 2026 at 04:54:27PM -0700, Jens Axboe wrote:
> Currently a few pointer dereferences need to be made to both check if
> BPF filters are installed, and then also to retrieve the actual filter
> for the opcode. Cache the table in ctx->bpf_filters to avoid that.
>
> Add a bit of debug info on ring exit to show if we ever got this wrong.
> Small risk of that given that the table is currently only updated in one
> spot, but once task forking is enabled, that will add one more spot.
>
> Signed-off-by: Jens Axboe <axboe@kernel.dk>
> ---
Reviewed-by: Christian Brauner <brauner@kernel.org>
next prev parent reply other threads:[~2026-01-27 9:33 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-19 23:54 [PATCHSET v6] Inherited restrictions and BPF filtering for io_uring Jens Axboe
2026-01-19 23:54 ` [PATCH 1/7] io_uring: add support for BPF filtering for opcode restrictions Jens Axboe
2026-01-27 10:06 ` Christian Brauner
2026-01-27 16:41 ` Jens Axboe
2026-01-19 23:54 ` [PATCH 2/7] io_uring/net: allow filtering on IORING_OP_SOCKET data Jens Axboe
2026-01-19 23:54 ` [PATCH 3/7] io_uring/bpf_filter: allow filtering on contents of struct open_how Jens Axboe
2026-01-27 9:33 ` Christian Brauner
2026-01-19 23:54 ` [PATCH 4/7] io_uring/bpf_filter: cache lookup table in ctx->bpf_filters Jens Axboe
2026-01-27 9:33 ` Christian Brauner [this message]
2026-01-19 23:54 ` [PATCH 5/7] io_uring/bpf_filter: add ref counts to struct io_bpf_filter Jens Axboe
2026-01-27 9:34 ` Christian Brauner
2026-01-19 23:54 ` [PATCH 6/7] io_uring: add task fork hook Jens Axboe
2026-01-27 10:07 ` Christian Brauner
2026-01-19 23:54 ` [PATCH 7/7] io_uring: allow registration of per-task restrictions Jens Axboe
2026-01-22 3:37 ` [PATCHSET v6] Inherited restrictions and BPF filtering for io_uring Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2026-01-27 18:29 [PATCHSET v7] " Jens Axboe
2026-01-27 18:29 ` [PATCH 4/7] io_uring/bpf_filter: cache lookup table in ctx->bpf_filters Jens Axboe
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