linux-kernel - [PATCH] perf tools pt: Remove obsolete paragraph in intel-pt.c

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Tue,  8 Nov 2016 16:11:00 -0800
From:   Andi Kleen <andi@...stfloor.org>
To:     acme@...nel.org
Cc:     linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
        adrian.hunter@...el.com
Subject: [PATCH] perf tools pt: Remove obsolete paragraph in intel-pt.c

From: Andi Kleen <ak@...ux.intel.com>

Since the unprivileged sched switch event was added in perf,
PT doesn't need need perf_event_paranoid=-1 anymore for
per cpu decoding. So remove the obsolete paragraph in
the documentation.

Cc: adrian.hunter@...el.com
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 tools/perf/Documentation/intel-pt.txt | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/tools/perf/Documentation/intel-pt.txt b/tools/perf/Documentation/intel-pt.txt
index c6c8318e38a2..c7f817fd3611 100644
--- a/tools/perf/Documentation/intel-pt.txt
+++ b/tools/perf/Documentation/intel-pt.txt
@@ -550,16 +550,6 @@ Unless /proc/sys/kernel/perf_event_paranoid is set to -1, unprivileged users
 have memory limits imposed upon them.  That affects what buffer sizes they can
 have as outlined above.
 
-Unless /proc/sys/kernel/perf_event_paranoid is set to -1, unprivileged users are
-not permitted to use tracepoints which means there is insufficient side-band
-information to decode Intel PT in per-cpu mode, and potentially workload-only
-mode too if the workload creates new processes.
-
-Note also, that to use tracepoints, read-access to debugfs is required.  So if
-debugfs is not mounted or the user does not have read-access, it will again not
-be possible to decode Intel PT in per-cpu mode.
-
-
 sched_switch tracepoint
 -----------------------
 
-- 
2.5.5