linux-kernel - Re: [PATCH v4 00/10] Move uid filtering to BPF filters

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Message-Id: <174958073941.4039944.6156587445391341437.b4-ty@kernel.org>
Date: Tue, 10 Jun 2025 11:38:59 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
 Arnaldo Carvalho de Melo <acme@...nel.org>, 
 Mark Rutland <mark.rutland@....com>, 
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
 Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>, 
 Kan Liang <kan.liang@...ux.intel.com>, James Clark <james.clark@...aro.org>, 
 Dapeng Mi <dapeng1.mi@...ux.intel.com>, 
 Thomas Richter <tmricht@...ux.ibm.com>, 
 Veronika Molnarova <vmolnaro@...hat.com>, Chun-Tse Shao <ctshao@...gle.com>, 
 Leo Yan <leo.yan@....com>, Hao Ge <gehao@...inos.cn>, 
 Howard Chu <howardchu95@...il.com>, Weilin Wang <weilin.wang@...el.com>, 
 Levi Yun <yeoreum.yun@....com>, 
 "Dr. David Alan Gilbert" <linux@...blig.org>, 
 Gautam Menghani <gautam@...ux.ibm.com>, 
 Tengda Wu <wutengda@...weicloud.com>, linux-perf-users@...r.kernel.org, 
 linux-kernel@...r.kernel.org, bpf@...r.kernel.org, 
 Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH v4 00/10] Move uid filtering to BPF filters

On Wed, 04 Jun 2025 10:45:34 -0700, Ian Rogers wrote:
> Rather than scanning /proc and skipping PIDs based on their UIDs, use
> BPF filters for uid filtering. The /proc scanning in thread_map is
> racy as the PID may exit before the perf_event_open causing perf to
> abort. BPF UID filters are more robust as they avoid the race. The
> /proc scanning also misses processes starting after the perf
> command. Add a helper for commands that support UID filtering and wire
> up. Remove the non-BPF UID filtering support given it doesn't work.
> 
> [...]
Applied to perf-tools-next, thanks!

Best regards,
Namhyung