kernel/tools/perf/util/evlist.c, branch linux-4.15.y

perf evlist: Add helper to check if attr.exclude_kernel is set in all evsels

2017-11-28T17:23:43Z

The warning about kptr_restrict needs to be emitted only when it is set and we ask for kernel space samples, so add a helper to help with that. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Linus Torvalds Cc: Namhyung Kim Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-fh7drty6yljei9gxxzer6eup@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf evlist: Set the correct idx when adding dummy events

2017-11-28T17:19:00Z

The evsel->idx field is used mainly to access the right bucket in per-event arrays such as the annotation ones, but also to set evsel->tracking, that in turn will decide what of the events will ask for PERF_RECORD_{MMAP,COMM,EXEC} to be generated, i.e. which perf_event_attr will have its mmap, etc fields set. When we were adding the "dummy" event using perf_evlist__add_dummy() we were not setting it correctly, which could result in multiple tracking events. Now that I'll try using a dummy event to be the tracking one when using 'perf record --delay', i.e. when we process the --delay setting we may already have the evlist set up, like with: perf record -e cycles,instructions --delay 1000 ./workload We will need to add a "dummy" event, then reset evsel->tracking for the first event, "cycles", and set it instead to the dummy one, and also setting its attr.enable_on_exec, so that we get the PERF_RECORD_MMAP, etc metadata events while waiting to enable the explicitely requested events, so lets get this straight and set the right evsel->idx. Cc: Adrian Hunter Cc: Bram Stolk Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-nrdfchshqxf7diszhxcecqb9@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf mmap: Move perf_mmap and methods to separate mmap.[ch] files

2017-10-23T14:20:53Z

To better organize the sources, and we may end up even using it directly, without evlists and evsels. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-oiqrm7grflurnnzo2ovfnslg@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf evsel: Fix buffer overflow while freeing events

2017-08-22T14:51:31Z

Fix buffer overflow for: % perf stat -e msr/tsc/,cstate_core/c7-residency/ true that causes glibc free list corruption. For some reason it doesn't trigger in valgrind, but it is visible in AS: ================================================================= ==32681==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x603000003f5c at pc 0x0000005671ef bp 0x7ffdaaac9ac0 sp 0x7ffdaaac9ab0 READ of size 4 at 0x603000003f5c thread T0 #0 0x5671ee in perf_evsel__close_fd util/evsel.c:1196 #1 0x56c57a in perf_evsel__close util/evsel.c:1717 #2 0x55ed5f in perf_evlist__close util/evlist.c:1631 #3 0x4647e1 in __run_perf_stat /home/ak/hle/linux-hle-2.6/tools/perf/builtin-stat.c:749 #4 0x4648e3 in run_perf_stat /home/ak/hle/linux-hle-2.6/tools/perf/builtin-stat.c:767 #5 0x46e1bc in cmd_stat /home/ak/hle/linux-hle-2.6/tools/perf/builtin-stat.c:2785 #6 0x52f83d in run_builtin /home/ak/hle/linux-hle-2.6/tools/perf/perf.c:296 #7 0x52fd49 in handle_internal_command /home/ak/hle/linux-hle-2.6/tools/perf/perf.c:348 #8 0x5300de in run_argv /home/ak/hle/linux-hle-2.6/tools/perf/perf.c:392 #9 0x5308f3 in main /home/ak/hle/linux-hle-2.6/tools/perf/perf.c:530 #10 0x7f0672d13400 in __libc_start_main (/lib64/libc.so.6+0x20400) #11 0x428419 in _start (/home/ak/hle/obj-perf/perf+0x428419) 0x603000003f5c is located 0 bytes to the right of 28-byte region [0x603000003f40,0x603000003f5c) allocated by thread T0 here: #0 0x7f0675139020 in calloc (/lib64/libasan.so.3+0xc7020) #1 0x648a2d in zalloc util/util.h:23 #2 0x648a88 in xyarray__new util/xyarray.c:9 #3 0x566419 in perf_evsel__alloc_fd util/evsel.c:1039 #4 0x56b427 in perf_evsel__open util/evsel.c:1529 #5 0x56c620 in perf_evsel__open_per_thread util/evsel.c:1730 #6 0x461dea in create_perf_stat_counter /home/ak/hle/linux-hle-2.6/tools/perf/builtin-stat.c:263 #7 0x4637d7 in __run_perf_stat /home/ak/hle/linux-hle-2.6/tools/perf/builtin-stat.c:600 #8 0x4648e3 in run_perf_stat /home/ak/hle/linux-hle-2.6/tools/perf/builtin-stat.c:767 #9 0x46e1bc in cmd_stat /home/ak/hle/linux-hle-2.6/tools/perf/builtin-stat.c:2785 #10 0x52f83d in run_builtin /home/ak/hle/linux-hle-2.6/tools/perf/perf.c:296 #11 0x52fd49 in handle_internal_command /home/ak/hle/linux-hle-2.6/tools/perf/perf.c:348 #12 0x5300de in run_argv /home/ak/hle/linux-hle-2.6/tools/perf/perf.c:392 #13 0x5308f3 in main /home/ak/hle/linux-hle-2.6/tools/perf/perf.c:530 #14 0x7f0672d13400 in __libc_start_main (/lib64/libc.so.6+0x20400) The event is allocated with cpus == 1, but freed with cpus == real number When the evsel close function walks the file descriptors it exceeds the fd xyarray boundaries and reads random memory. v2: Now that xyarrays save their original dimensions we can use these to iterate the two dimensional fd arrays. Fix some users (close, ioctl) in evsel.c to use these fields directly. This allows simplifying the code and dropping quite a few function arguments. Adjust all callers by removing the unneeded arguments. The actual perf event reading still uses the original values from the evsel list. Signed-off-by: Andi Kleen Acked-by: Jiri Olsa Link: http://lkml.kernel.org/r/20170811232634.30465-2-andi@firstfloor.org [ Fix up xy_max_[xy]() -> xyarray__max_[xy]() ] Signed-off-by: Arnaldo Carvalho de Melo

perf evlist: Allow asking for max precise_ip in add_default()

2017-07-19T02:14:12Z

There are cases where we want to leave attr.precise_ip as zero, such as when using 'perf record --no-samples', where this would make the kernel return -EINVAL. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-0u2m2a8rqw781r6m8svqyne8@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf evsel: Allow asking for max precise_ip in new_cycles()

2017-07-19T02:14:12Z

There are cases where we want to leave attr.precise_ip as zero, such as when using 'perf record --no-samples', where this would make the kernel return -EINVAL. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-4zq1udecxa51gsapyfwej5fj@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Remove sys/ioctl.h from util.h

2017-04-24T16:43:32Z

Not needed in this header, added to the places that need 'struct winsize' and the ioctl defines. Link: http://lkml.kernel.org/n/tip-2pznlli3146y4242otlcm70m@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Move units conversion/formatting routines to separate object

2017-04-20T16:22:44Z

Out of util.h, to disentangle it a bit more. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-vpksyj3w5fk9t8s6mxmkajyr@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Add signal.h to places using its definitions

2017-04-20T16:22:43Z

And remove it from util.h, disentangling it a bit more. Link: http://lkml.kernel.org/n/tip-2zg9s5nx90yde64j3g4z2uhk@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Include errno.h where needed

2017-04-19T16:01:51Z

Removing it from util.h, part of an effort to disentangle the includes hell, that makes changes to util.h or something included by it to cause a complete rebuild of the tools. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-ztrjy52q1rqcchuy3rubfgt2@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo