netdev - [PATCH bpf v2 0/3] bpf: two fixes for bpf iterators

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Date:   Tue, 18 Aug 2020 15:23:09 -0700
From:   Yonghong Song <yhs@...com>
To:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>
Subject: [PATCH bpf v2 0/3] bpf: two fixes for bpf iterators

Patch #1 fixed a rcu stall warning when traversing large number
of tasks/files without overflowing seq_file buffer. The method
is to control the number of visited objects in bpf_seq_read()
so all bpf iterators will benefit.

Patch #2 calculated tid properly in a namespace in order to avoid
visiting the name task multiple times.

Patch #3 handled read() error code EAGAIN properly in bpftool
bpf_iter userspace code to collect pids. The change is needed
due to Patch #1.

Yonghong Song (3):
  bpf: fix a rcu_sched stall issue with bpf task/task_file iterator
  bpf: avoid visit same object multiple times
  bpftool: handle EAGAIN error code properly in pids collection

 kernel/bpf/bpf_iter.c    | 15 ++++++++++++++-
 kernel/bpf/task_iter.c   |  3 ++-
 tools/bpf/bpftool/pids.c |  2 ++
 3 files changed, 18 insertions(+), 2 deletions(-)

-- 
2.24.1