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Message-ID: <72692317-ee96-1b4d-3f93-c0b148baa7ec@isovalent.com>
Date: Sat, 20 Jun 2020 02:46:13 +0100
From: Quentin Monnet <quentin@...valent.com>
To: Andrii Nakryiko <andriin@...com>, bpf@...r.kernel.org,
netdev@...r.kernel.org, ast@...com, daniel@...earbox.net
Cc: andrii.nakryiko@...il.com, kernel-team@...com,
Hao Luo <haoluo@...gle.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Song Liu <songliubraving@...com>
Subject: Re: [PATCH v3 bpf-next 8/9] tools/bpftool: show info for processes
holding BPF map/prog/link/btf FDs
2020-06-19 16:17 UTC-0700 ~ Andrii Nakryiko <andriin@...com>
> Add bpf_iter-based way to find all the processes that hold open FDs against
> BPF object (map, prog, link, btf). bpftool always attempts to discover this,
> but will silently give up if kernel doesn't yet support bpf_iter BPF programs.
> Process name and PID are emitted for each process (task group).
>
> Sample output for each of 4 BPF objects:
>
> $ sudo ./bpftool prog show
> 2694: cgroup_device tag 8c42dee26e8cd4c2 gpl
> loaded_at 2020-06-16T15:34:32-0700 uid 0
> xlated 648B jited 409B memlock 4096B
> pids systemd(1)
> 2907: cgroup_skb name egress tag 9ad187367cf2b9e8 gpl
> loaded_at 2020-06-16T18:06:54-0700 uid 0
> xlated 48B jited 59B memlock 4096B map_ids 2436
> btf_id 1202
> pids test_progs(2238417), test_progs(2238445)
>
> $ sudo ./bpftool map show
> 2436: array name test_cgr.bss flags 0x400
> key 4B value 8B max_entries 1 memlock 8192B
> btf_id 1202
> pids test_progs(2238417), test_progs(2238445)
> 2445: array name pid_iter.rodata flags 0x480
> key 4B value 4B max_entries 1 memlock 8192B
> btf_id 1214 frozen
> pids bpftool(2239612)
>
> $ sudo ./bpftool link show
> 61: cgroup prog 2908
> cgroup_id 375301 attach_type egress
> pids test_progs(2238417), test_progs(2238445)
> 62: cgroup prog 2908
> cgroup_id 375344 attach_type egress
> pids test_progs(2238417), test_progs(2238445)
>
> $ sudo ./bpftool btf show
> 1202: size 1527B prog_ids 2908,2907 map_ids 2436
> pids test_progs(2238417), test_progs(2238445)
> 1242: size 34684B
> pids bpftool(2258892)
>
> Signed-off-by: Andrii Nakryiko <andriin@...com>
Reviewed-by: Quentin Monnet <quentin@...valent.com>
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