kernel/tools/perf/util/hist.c, branch linux-5.2.y

perf report: Fix --ns time sort key output

2019-10-05T11:13:49Z

[ Upstream commit 3dab6ac080dcd7f71cb9ceb84ad7dafecd6f7c07 ] If the user specified --ns, the column to print the sort time stamp wasn't wide enough to actually print the full nanoseconds. Widen the time key column width when --ns is specified. Before: % perf record -a sleep 1 % perf report --sort time,overhead,symbol --stdio --ns ... 2.39% 187851.10000 [k] smp_call_function_single - - 1.53% 187851.10000 [k] intel_idle - - 0.59% 187851.10000 [.] __wcscmp_ifunc - - 0.33% 187851.10000 [.] 0000000000000000 - - 0.28% 187851.10000 [k] cpuidle_enter_state - - After: % perf report --sort time,overhead,symbol --stdio --ns ... 2.39% 187851.100000000 [k] smp_call_function_single - - 1.53% 187851.100000000 [k] intel_idle - - 0.59% 187851.100000000 [.] __wcscmp_ifunc - - 0.33% 187851.100000000 [.] 0000000000000000 - - 0.28% 187851.100000000 [k] cpuidle_enter_state - - Signed-off-by: Andi Kleen Tested-by: Arnaldo Carvalho de Melo Cc: Jiri Olsa Link: http://lkml.kernel.org/r/20190823210338.12360-2-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin

perf hist: Add missing map__put() in error case

2019-03-19T19:52:04Z

We need to map__put() before returning from failure of sample__resolve_callchain(). Detected with gcc's ASan. Signed-off-by: Changbin Du Reviewed-by: Jiri Olsa Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: Krister Johansen Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Steven Rostedt (VMware) Fixes: 9c68ae98c6f7 ("perf callchain: Reference count maps") Link: http://lkml.kernel.org/r/20190316080556.3075-10-changbin.du@gmail.com Signed-off-by: Arnaldo Carvalho de Melo

perf report: Implement browsing of individual samples

2019-03-11T19:33:19Z

Now 'perf report' can show whole time periods with 'perf script', but the user still has to find individual samples of interest manually. It would be expensive and complicated to search for the right samples in the whole perf file. Typically users only need to look at a small number of samples for useful analysis. Also the full scripts tend to show samples of all CPUs and all threads mixed up, which can be very confusing on larger systems. Add a new --samples option to save a small random number of samples per hist entry. Use a reservoir sample technique to select a representatve number of samples. Then allow browsing the samples using 'perf script' as part of the hist entry context menu. This automatically adds the right filters, so only the thread or cpu of the sample is displayed. Then we use less' search functionality to directly jump the to the time stamp of the selected sample. It uses different menus for assembler and source display. Assembler needs xed installed and source needs debuginfo. Currently it only supports as many samples as fit on the screen due to some limitations in the slang ui code. Signed-off-by: Andi Kleen Tested-by: Arnaldo Carvalho de Melo Acked-by: Jiri Olsa Link: http://lkml.kernel.org/r/20190311174605.GA29294@tassilo.jf.intel.com Signed-off-by: Arnaldo Carvalho de Melo

perf report: Support time sort key

2019-03-11T19:32:31Z

Add a time sort key to perf report to display samples for different time quantums separately. This allows easier analysis of workloads that change over time, and also will allow looking at the context of samples. % perf record ... % perf report --sort time,overhead,symbol --time-quantum 1ms --stdio ... 0.67% 277061.87300 [.] _dl_start 0.50% 277061.87300 [.] f1 0.50% 277061.87300 [.] f2 0.33% 277061.87300 [.] main 0.29% 277061.87300 [.] _dl_lookup_symbol_x 0.29% 277061.87300 [.] dl_main 0.29% 277061.87300 [.] do_lookup_x 0.17% 277061.87300 [.] _dl_debug_initialize 0.17% 277061.87300 [.] _dl_init_paths 0.08% 277061.87300 [.] check_match 0.04% 277061.87300 [.] _dl_count_modids 1.33% 277061.87400 [.] f1 1.33% 277061.87400 [.] f2 1.33% 277061.87400 [.] main 1.17% 277061.87500 [.] main 1.08% 277061.87500 [.] f1 1.08% 277061.87500 [.] f2 1.00% 277061.87600 [.] main 0.83% 277061.87600 [.] f1 0.83% 277061.87600 [.] f2 1.00% 277061.87700 [.] main Committer notes: Rename 'time' argument to hist_time() to htime to overcome this in older distros: cc1: warnings being treated as errors util/hist.c: In function 'hist_time': util/hist.c:251: error: declaration of 'time' shadows a global declaration /usr/include/time.h:186: error: shadowed declaration is here Signed-off-by: Andi Kleen Acked-by: Jiri Olsa Link: http://lkml.kernel.org/r/20190311144502.15423-4-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo

perf hist: Fix memory leak of srcline

2019-03-06T21:16:57Z

We can't allocate he->srcline unconditionaly, only when new hist_entry is created. Moving he->srcline allocation into hist_entry__init function. Original-patch-by: Jonas Rabenstein Suggested-by: Namhyung Kim Signed-off-by: Jiri Olsa Cc: Alexander Shishkin Cc: Andi Kleen Cc: Nageswara R Sastry Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Ravi Bangoria Link: http://lkml.kernel.org/r/20190305152536.21035-4-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf hist: Add error path into hist_entry__init

2019-03-06T21:16:30Z

Adding error path into hist_entry__init to unify error handling, so every new member does not need to free everything else. Signed-off-by: Jiri Olsa Cc: Alexander Shishkin Cc: Andi Kleen Cc: Jonas Rabenstein Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Ravi Bangoria Cc: nageswara r sastry Link: http://lkml.kernel.org/r/20190305152536.21035-3-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf evsel: Add output_resort_cb method

2019-02-06T13:00:40Z

Add perf_evsel__output_resort_cb() so we have an interface with a callback for each hist entry. It will be used in the following patch. Signed-off-by: Jiri Olsa Cc: Alexander Shishkin Cc: Jin Yao Cc: Kan Liang Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20190204141808.23031-3-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf hists: Add argument to hists__resort_cb_t callback

2019-02-06T13:00:39Z

Add argument to hists__resort_cb_t so that we can pass data from upper layers to the callback function. It will be used in the following patches. Signed-off-by: Jiri Olsa Cc: Alexander Shishkin Cc: Jin Yao Cc: Kan Liang Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20190204141808.23031-2-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Add missing include in various places

2019-02-06T13:00:38Z

Its getting it from hist.h and that will go away, as that header doesn't need callchain.h at all. Cc: Adrian Hunter Cc: Jiri Olsa Cc: Namhyung Kim Link: https://lkml.kernel.org/n/tip-6ebl3mwwiqocl79yts44qltu@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Add missing include for symbols.h

2019-02-06T13:00:38Z

Several places were using definitions found in symbols.h but not including it, getting it by sheer luck from some other headers that now are in the process of removing that include because they don't need it or because simply having struct forward declarations is enough, fix it. Cc: Adrian Hunter Cc: Jiri Olsa Cc: Namhyung Kim Link: https://lkml.kernel.org/n/tip-xbcvvx296d70kpg9wb0qmeq9@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo