Hi Matthias, the purpose of this file is only to satisfy the build. JFR is not supported on AIX. I guess almost nothing of this file works. There are more things which could get removed. E.g. get_systemtype, get_jvm_ticks, etc. contain linux stuff. Best regards, Martin -----Original Message----- From: hotspot-dev <hotspot-dev-bounces@openjdk.java.net> On Behalf Of Baesken, Matthias Sent: Dienstag, 9. April 2019 09:40 To: 'hotspot-dev@openjdk.java.net' <hotspot-dev@openjdk.java.net>; ppc-aix-port-dev@openjdk.java.net Cc: Simonis, Volker <volker.simonis@sap.com> Subject: RFR: 8221915: cleanup ticks related coding in os_perf_aix.cpp [aix] Hello, please review this small AIX related cleanup change . When recently looking into the os_perf coding , I noticed that we try to read (on AIX) cpu ticks related data from /proc/stat . However this will most likely fail, on the AIX machines I checked there is a /proc but no /proc/stat . (probably the AIX coding has been taken over from linux) The change cleans up the coding in os_perf_aix.cpp . ( there might be other ways to get the CPU ticks related info on AIX e.g. by using libperfstat or by using what <sys/procfs.h> has to offer, see https://www.ibm.com/support/knowledgecenter/en/ssw_aix_71/com.ibm.aix.files/... , but this should be checked and maybe added with another change in case someone is interested ) Bug/webrev : https://bugs.openjdk.java.net/browse/JDK-8221915 http://cr.openjdk.java.net/~mbaesken/webrevs/8221915.0/ Thanks, Matthias