- Oct 24, 2017
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Milian Wolff authored
This is mostly a preparation to enable the creation of full callchain nodes for inline frames. Such frames will reference the IP of the non-inlined frame, but hold the symbol and srcline for an inlined location. As such, we won't be able to query the srcline on-demand based on the IP alone. Instead, we will leverage the functionality provided by this patch here, and store the srcline for the inlined nodes in the new srcline member of callchain_cursor_node. Note that this patch on its own leaks the srcline, as there is no free_callchain_cursor_node or similar. A future patch will add caching of the srcline and handle deletion properly. Signed-off-by:
Milian Wolff <milian.wolff@kdab.com> Reviewed-by:
Jiri Olsa <jolsa@redhat.com> Reviewed-by:
Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Yao Jin <yao.jin@linux.intel.com> Link: http://lkml.kernel.org/r/20171009203310.17362-3-milian.wolff@kdab.com Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Milian Wolff authored
The follow-up commits will make inline frames first-class citizens in the callchain, thereby obsoleting all of this special code. Signed-off-by:
Milian Wolff <milian.wolff@kdab.com> Reviewed-by:
Jiri Olsa <jolsa@redhat.com> Reviewed-by:
Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Yao Jin <yao.jin@linux.intel.com> Link: http://lkml.kernel.org/r/20171009203310.17362-2-milian.wolff@kdab.com Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Ingo Molnar authored
Merge tag 'perf-core-for-mingo-4.15-20171023' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo: - Update vendor events JSON metrics for Intel's Broadwell, Broadwell Server, Haswell, Haswell Server, IvyBridge, IvyTown, JakeTown, Sandy Bridge, Skylake and SkyLake Server (Andi Kleen) - Add vendor event file for Intel's Goldmont Plus V1 (Kan Liang) - Move perf_mmap methods from 'perf record' and evlist.c to a separate mmap.[ch] pair, to better separate things and pave the way for further work on multithreading tools (Arnaldo Carvalho de Melo) - Do not check ABI headers in a detached tarball build, as it the kernel headers from where we copied tools/include/ are by definition not available (Arnaldo Carvalho de Melo) - Make 'perf script' use fprintf() like printing, i.e. receiving a FILE pointer so that it gets consistent with other tools/ code and allows for printing to per-event files (Arnaldo Carvalho de Melo) - Error handling fixes (resource release on exit) for 'perf script' and 'perf kmem' (Christophe JAILLET) - Make some 'perf event attr' tests optional on virtual machines, where tested counters are not available (Jiri Olsa) Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by:
Ingo Molnar <mingo@kernel.org>
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Kan Liang authored
Add a Intel event file for perf. Signed-off-by:
Kan Liang <Kan.liang@intel.com> Acked-by:
Andi Kleen <ak@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Kan Liang <kan.liang@intel.com> Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/1508331907-395162-1-git-send-email-kan.liang@intel.com Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Arnaldo Carvalho de Melo authored
We don't need perf.h, that is a kitchen sink, all we need is perf_events.h for perf_ns_link_info, sys/types.h for pid_t and linux/types.h for u64, list_head. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Li Zhijian <lizhijian@cn.fujitsu.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-f2uxyaj4s2hmntkrezpa6dqz@git.kernel.org Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Christophe JAILLET authored
If the string passed in '--time' is invalid, we must do some cleanup before leaving. As in the other error handling paths of this function. Signed-off-by:
Christophe JAILLET <christophe.jaillet@wanadoo.fr> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: kernel-janitors@vger.kernel.org Fixes: 2a865bd8 ("perf kmem: Add option to specify time window of interest") Link: http://lkml.kernel.org/r/20170916060936.28199-1-christophe.jaillet@wanadoo.fr Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Christophe JAILLET authored
If the string passed in '--time' is invalid, or if failed to set libtraceevent function resolver, we must do some cleanup before leaving. As in the other error handling paths of this function. Signed-off-by:
Christophe JAILLET <christophe.jaillet@wanadoo.fr> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: kernel-janitors@vger.kernel.org Link: http://lkml.kernel.org/r/20170916062537.28921-1-christophe.jaillet@wanadoo.fr Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Arnaldo Carvalho de Melo authored
We've been mixing print() with fprintf() style printing for a while, but now we need to use fprintf() like syntax uniformly as a preparatory patch for supporting printing to different files, one per event. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Cc: yuzhoujian <yuzhoujian@didichuxing.com> Link: http://lkml.kernel.org/n/tip-kv5z3v8ptfghbarv3a9usvin@git.kernel.org Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Arnaldo Carvalho de Melo authored
Out of print_binary() but receiving a fp pointer and expecting that the printer be a fprintf like function, i.e. receive a FILE pointer and return the number of characters printed. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Cc: yuzhoujian <yuzhoujian@didichuxing.com> Link: http://lkml.kernel.org/n/tip-6oqnxr6lmgqe6q6p3iugnscx@git.kernel.org Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Andi Kleen authored
Some of the metrics use an incorrect syntax for specifying the cmask for an event. Convert to perf syntax so that they can be resolved. Fixes metrics on Broadwell, SandyBridge. Signed-off-by:
Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/n/tip-3k3fkfj8obek9dkmryyrqzhu@git.kernel.org Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Arnaldo Carvalho de Melo authored
When we use one of: [acme@jouet linux]$ make help | grep perf perf-tar-src-pkg - Build perf-4.14.0-rc3.tar source tarball perf-targz-src-pkg - Build perf-4.14.0-rc3.tar.gz source tarball perf-tarbz2-src-pkg - Build perf-4.14.0-rc3.tar.bz2 source tarball perf-tarxz-src-pkg - Build perf-4.14.0-rc3.tar.xz source tarball [acme@jouet linux]$ I.e. when we create a detached tarball to build perf outside outside the enveloping kernel sources (from a kernel tarball or a checked out linux.git directory) we by definition can't check for differences among the tools/{include,arch}, etc files we originally copied from the kernel, so bail out in that case, to avoid warnings when doing the detached builds. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-vbrga0mhplv7niwxr3ghjyxv@git.kernel.org Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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- Oct 23, 2017
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Jiri Olsa authored
There's no need for extra cpuid_parse arch callback, it can be handled directly in init callback. Adding the init function to x86 to cover the cpuid initialization. Signed-off-by:
Jiri Olsa <jolsa@kernel.org> Cc: Andi Kleen <andi@firstfloor.org> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20171011150158.11895-2-jolsa@kernel.org Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Andi Kleen authored
Fix an incorrect description in the 'perf list' manpage. When a group does not fit into the hardware it is partially scheduled, but does not error out. Signed-off-by:
Andi Kleen <ak@linux.intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Link: http://lkml.kernel.org/r/20171010224322.15861-1-andi@firstfloor.org Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Jiri Olsa authored
Otherwise we fail on virtual machines with no support for specific HW events. Signed-off-by:
Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20171009130712.14747-1-jolsa@kernel.org Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Arnaldo Carvalho de Melo authored
The previous prep patch was just to show exactly what changed in that function, now its time to move that method and things only it uses to the right place, mmap.[ch] Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-aaxywfgw3d44x6xlu8zm1avu@git.kernel.org Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Arnaldo Carvalho de Melo authored
It becomes a perf_mmap method, "push", that build reads from a mmap and "pushes" it to a consumer, that in the initial case, for 'perf record', just writes it to the perf.data file descriptor, but may be used by 'top', etc. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-u4l1qjbi6l76r2k0nv99220n@git.kernel.org Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Arnaldo Carvalho de Melo authored
To better organize the sources, and we may end up even using it directly, without evlists and evsels. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-oiqrm7grflurnnzo2ovfnslg@git.kernel.org Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Andi Kleen authored
Signed-off-by:
Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/20170914200748.GA13837@tassilo.jf.intel.com Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Andi Kleen authored
Signed-off-by:
Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/20170914200748.GA13837@tassilo.jf.intel.com Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Andi Kleen authored
Signed-off-by:
Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/20170914200748.GA13837@tassilo.jf.intel.com Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Andi Kleen authored
Signed-off-by:
Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/20170914200748.GA13837@tassilo.jf.intel.com Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Andi Kleen authored
Signed-off-by:
Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/20170914200748.GA13837@tassilo.jf.intel.com Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Andi Kleen authored
Signed-off-by:
Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/20170914200748.GA13837@tassilo.jf.intel.com Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Andi Kleen authored
Signed-off-by:
Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/20170914200748.GA13837@tassilo.jf.intel.com Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Andi Kleen authored
Signed-off-by:
Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/20170914200748.GA13837@tassilo.jf.intel.com Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Andi Kleen authored
Signed-off-by:
Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/20170914200748.GA13837@tassilo.jf.intel.com Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Andi Kleen authored
Signed-off-by:
Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/20170914200748.GA13837@tassilo.jf.intel.com Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Kees Cook authored
The jprobes subsystem is being removed, so convert to using kprobes instead. Signed-off-by:
Kees Cook <keescook@chromium.org> Acked-by:
Masami Hiramatsu <mhiramat@kernel.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20171020133127.GA18360@beast Signed-off-by:
Ingo Molnar <mingo@kernel.org>
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- Oct 20, 2017
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Masami Hiramatsu authored
Remove jprobes related documentation from kprobes.txt. Also add some migration advice for the people who are still using jprobes. Signed-off-by:
Masami Hiramatsu <mhiramat@kernel.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: David S . Miller <davem@davemloft.net> Cc: Ian McDonald <ian.mcdonald@jandi.co.nz> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephen Hemminger <stephen@networkplumber.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vlad Yasevich <vyasevich@gmail.com> Link: http://lkml.kernel.org/r/150724539698.5014.7300022363980503141.stgit@devbox [ Fixes to the new documentation. ] Signed-off-by:
Ingo Molnar <mingo@kernel.org>
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Masami Hiramatsu authored
Remove the jprobes sample module because jprobes are deprecated. Signed-off-by:
Masami Hiramatsu <mhiramat@kernel.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: David S . Miller <davem@davemloft.net> Cc: Ian McDonald <ian.mcdonald@jandi.co.nz> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephen Hemminger <stephen@networkplumber.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vlad Yasevich <vyasevich@gmail.com> Link: http://lkml.kernel.org/r/150724535709.5014.7261513316230565780.stgit@devbox Signed-off-by:
Ingo Molnar <mingo@kernel.org>
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Masami Hiramatsu authored
Disable jprobes test code because jprobes are deprecated. This code will be completely removed when the jprobe code is removed. Signed-off-by:
Masami Hiramatsu <mhiramat@kernel.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: David S . Miller <davem@davemloft.net> Cc: Ian McDonald <ian.mcdonald@jandi.co.nz> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephen Hemminger <stephen@networkplumber.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vlad Yasevich <vyasevich@gmail.com> Link: http://lkml.kernel.org/r/150724531730.5014.6377596890962355763.stgit@devbox Signed-off-by:
Ingo Molnar <mingo@kernel.org>
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Masami Hiramatsu authored
Disable the jprobes APIs and comment out the jprobes API function code. This is in preparation of removing all jprobes related code (including kprobe's break_handler). Nowadays ftrace and other tracing features are mature enough to replace jprobes use-cases. Users can safely use ftrace and perf probe etc. for their use cases. Signed-off-by:
Masami Hiramatsu <mhiramat@kernel.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: David S . Miller <davem@davemloft.net> Cc: Ian McDonald <ian.mcdonald@jandi.co.nz> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephen Hemminger <stephen@networkplumber.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vlad Yasevich <vyasevich@gmail.com> Link: http://lkml.kernel.org/r/150724527741.5014.15465541485637899227.stgit@devbox Signed-off-by:
Ingo Molnar <mingo@kernel.org>
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Ingo Molnar authored
Signed-off-by:
Ingo Molnar <mingo@kernel.org>
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Masami Hiramatsu authored
We want to wait for all potentially preempted kprobes trampoline execution to have completed. This guarantees that any freed trampoline memory is not in use by any task in the system anymore. synchronize_rcu_tasks() gives such a guarantee, so use it. Also, this guarantees to wait for all potentially preempted tasks on the instructions which will be replaced with a jump. Since this becomes a problem only when CONFIG_PREEMPT=y, enable CONFIG_TASKS_RCU=y for synchronize_rcu_tasks() in that case. Signed-off-by:
Masami Hiramatsu <mhiramat@kernel.org> Acked-by:
Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Naveen N . Rao <naveen.n.rao@linux.vnet.ibm.com> Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/150845661962.5443.17724352636247312231.stgit@devbox Signed-off-by:
Ingo Molnar <mingo@kernel.org>
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Ingo Molnar authored
Merge tag 'perf-urgent-for-mingo-4.14-20171019' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent Pull perf/urgent fixes from Arnaldo Carvalho de Melo: - Fix crash in perf_hpp__reset_output_field() (Jiri Olsa) - Fix eBPF file/vendor events ambiguity in event specification (Jiri Olsa) - Fix closing evsel fd in 'perf stat' (Jin Yao) - Make perf test shell trace+probe_libc_inet_pton.sh pass in Debian/Ubuntu (Li Zhijian) - Fix 'perf buildid-list --with-hits' crash when processing PERF_RECORD_NAMESPACE (Namhyung Kim) - Fix documentation for an inexistent option 'perf record -l' (Taeung Song) - Add long time reviewers to MAINTAINERS (Arnaldo Carvalho de Melo) Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by:
Ingo Molnar <mingo@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pmLinus Torvalds authored
Pull power management fix from Rafael Wysocki: "This reverts a problematic commit modifying the turbostat utility that went in during the 4.13 cycle (Len Brown)" * tag 'pm-4.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: Revert "tools/power turbostat: stop migrating, unless '-m'"
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Paul E. McKenney authored
Because many of RCU's files have not been included into docbook, a number of errors have accumulated. This commit fixes them. Signed-off-by:
Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Paul E. McKenney authored
Commit 764f8079 ("doc: Add RCU files to docbook-generation files") added :external: options for RCU source files in the file Documentation/core-api/kernel-api.rst. However, this now means nothing, so this commit removes them. Reported-by:
Randy Dunlap <rdunlap@infradead.org> Reported-by:
Akira Yokosawa <akiyks@gmail.com> Signed-off-by:
Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Mathieu Desnoyers authored
This introduces a "register private expedited" membarrier command which allows eventual removal of important memory barrier constraints on the scheduler fast-paths. It changes how the "private expedited" membarrier command (new to 4.14) is used from user-space. This new command allows processes to register their intent to use the private expedited command. This affects how the expedited private command introduced in 4.14-rc is meant to be used, and should be merged before 4.14 final. Processes are now required to register before using MEMBARRIER_CMD_PRIVATE_EXPEDITED, otherwise that command returns EPERM. This fixes a problem that arose when designing requested extensions to sys_membarrier() to allow JITs to efficiently flush old code from instruction caches. Several potential algorithms are much less painful if the user register intent to use this functionality early on, for example, before the process spawns the second thread. Registering at this time removes the need to interrupt each and every thread in that process at the first expedited sys_membarrier() system call. Signed-off-by:
Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Acked-by:
Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linuxLinus Torvalds authored
Pull parisc fixes from Helge Deller: "Three small important fixes for the parisc architecture: - Export __cmpxchg_u64() symbol on 32bit kernel too. This unbreaks building the kernel with ixgbe kernel module. From Guenter Roeck. - Fix 64-bit atomic cmpxchg kernel helper function for 32-bit kernel in LWS code for userspace. This unbreaks e.g. the 64-bit variant of the glibc function __sync_fetch_and_add() with a 32-bit parisc kernel. From John David Anglin, tagged for backport to v3.13+. - Detect nonsynchronous CPU-internal cr16 cycle counters more reliable. This avoids stalled CPU warnings by the kernel soft lockup detector. From me, tagged for backport to v4.13+" * 'parisc-4.14-3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Fix detection of nonsynchronous cr16 cycle counters parisc: Export __cmpxchg_u64 unconditionally parisc: Fix double-word compare and exchange in LWS code on 32-bit kernels
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