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Wang Nan 7fb4b407a1 perf mmap: Don't discard prev in backward mode 
'perf record' can switch its output data file. The new output should
only store the data after switching. However, in overwrite backward
mode, the new output still can have data from before switching. That
also brings extra overhead.

At the end of mmap_read(), the position of the processed ring buffer is
saved in md->prev. Next mmap_read should be end in md->prev if it is not
overwriten. That avoids processing duplicate data.  However, md->prev is
discarded. So next the mmap_read() has to process whole valid ring
buffer, which probably includes old processed data.

Avoid calling backward_rb_find_range() when md->prev is still
available.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Tested-by: Kan Liang <kan.liang@intel.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mengting Zhang <zhangmengting@huawei.com>
Link: http://lkml.kernel.org/r/20171204165107.95327-3-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
 		2017-12-05 15:59:37 -03:00
..
Documentation perf c2c: Add a tip about cacheline events 2017-12-05 15:43:55 -03:00
arch perf evlist: Remove 'overwrite' parameter from perf_evlist__mmap 2017-12-05 15:43:53 -03:00
bench perf bench futex: Sync waker threads 2017-12-05 10:23:44 -03:00
jvmti License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pmu-events perf vendor events: Use more flexible pattern matching for CPU identification for mapfile.csv 2017-12-05 15:43:55 -03:00
python License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
scripts License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tests perf evlist: Remove 'overwrite' parameter from perf_evlist__mmap 2017-12-05 15:43:53 -03:00
trace tools headers: Syncronize mman.h ABI header 2017-11-28 14:31:56 -03:00
ui perf tools: Move symbol__calc_percent() call to outside symbol__disassemble() 2017-11-17 12:16:26 -03:00
util perf mmap: Don't discard prev in backward mode 2017-12-05 15:59:37 -03:00
.gitignore perf tools: Ignore generated files pmu-events/{jevents,pmu-events.c} for git 2017-03-13 10:59:36 -03:00
Build perf trace: Only build tools/perf/trace/beauty/ when building 'perf trace' 2017-07-18 23:13:52 -03:00
CREDITS
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MANIFEST perf tools: Get all of tools/{arch,include}/ in the MANIFEST 2017-09-25 10:39:43 -03:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Makefile.config perf tools: Fix up build in hardnened environments 2017-12-05 15:43:52 -03:00
Makefile.perf perf trace beauty kcmp: Beautify arguments 2017-10-31 16:17:04 -03:00
builtin-annotate.c Merge branch 'linus' into perf/core, to fix conflicts 2017-11-07 10:30:18 +01:00
builtin-bench.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
builtin-buildid-cache.c perf buildid-cache: Update help text for purge command 2017-11-16 14:49:54 -03:00
builtin-buildid-list.c Merge branch 'linus' into perf/core, to fix conflicts 2017-11-07 10:30:18 +01:00
builtin-c2c.c perf c2c: Fix spelling mistakes in browser help text 2017-11-16 14:50:03 -03:00
builtin-config.c Merge branch 'linus' into perf/core, to fix conflicts 2017-11-07 10:30:18 +01:00
builtin-data.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
builtin-diff.c Merge branch 'linus' into perf/core, to fix conflicts 2017-11-07 10:30:18 +01:00
builtin-evlist.c Merge branch 'linus' into perf/core, to fix conflicts 2017-11-07 10:30:18 +01:00
builtin-ftrace.c tools include: Adopt strstarts() from the kernel 2017-07-20 15:46:10 -03:00
builtin-help.c perf help: Fix a bug during strstart() conversion 2017-11-28 14:21:18 -03:00
builtin-inject.c Merge branch 'linus' into perf/core, to fix conflicts 2017-11-07 10:30:18 +01:00
builtin-kallsyms.c perf tools: Including missing inttypes.h header 2017-04-19 13:01:46 -03:00
builtin-kmem.c Merge branch 'linus' into perf/core, to fix conflicts 2017-11-07 10:30:18 +01:00
builtin-kvm.c perf evlist: Remove 'overwrite' parameter from perf_evlist__mmap 2017-12-05 15:43:53 -03:00
builtin-list.c Merge branch 'linus' into perf/core, to fix conflicts 2017-11-07 10:30:18 +01:00
builtin-lock.c Merge branch 'linus' into perf/core, to fix conflicts 2017-11-07 10:30:18 +01:00
builtin-mem.c Merge branch 'linus' into perf/core, to fix conflicts 2017-11-07 10:30:18 +01:00
builtin-probe.c perf buildid-cache: Support binary objects from other namespaces 2017-07-18 23:14:11 -03:00
builtin-record.c perf mmap: Remove overwrite from arguments list of perf_mmap__push 2017-12-05 15:43:54 -03:00
builtin-report.c perf report: Set browser mode right before setup_browser() 2017-12-05 15:43:56 -03:00
builtin-sched.c Merge branch 'linus' into perf/core, to fix conflicts 2017-11-07 10:30:18 +01:00
builtin-script.c perf script: Allow computing 'perf stat' style metrics 2017-11-29 18:18:01 -03:00
builtin-stat.c perf record: Synthesize unit/scale/... in event update 2017-11-29 18:18:00 -03:00
builtin-timechart.c perf tools: Add struct perf_data_file 2017-10-30 13:37:37 -03:00
builtin-top.c perf evlist: Remove 'overwrite' parameter from perf_evlist__mmap 2017-12-05 15:43:53 -03:00
builtin-trace.c perf evlist: Remove 'overwrite' parameter from perf_evlist__mmap 2017-12-05 15:43:53 -03:00
builtin-version.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
builtin.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
check-headers.sh tools headers: Follow the upstream UAPI header version 100% differ from the kernel 2017-11-29 18:17:59 -03:00
command-list.txt perf tools: Missing c2c command in command-list 2017-03-13 10:59:31 -03:00
design.txt
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perf-archive.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
perf-completion.sh License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
perf-read-vdso.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
perf-sys.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
perf-with-kcore.sh perf tools: Fix perf-with-kcore handling of arguments containing spaces 2015-08-06 16:48:27 -03:00
perf.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
perf.h Merge branch 'linus' into perf/core, to fix conflicts 2017-11-07 10:30:18 +01:00