perf-diff(1) ============ NAME ---- perf-diff - Read perf.data files and display the differential profile SYNOPSIS -------- [verse] 'perf diff' [baseline file] [data file1] [[data file2] ... ] DESCRIPTION ----------- This command displays the performance difference amongst two or more perf.data files captured via perf record. If no parameters are passed it will assume perf.data.old and perf.data. The differential profile is displayed only for events matching both specified perf.data files. If no parameters are passed the samples will be sorted by dso and symbol. As the perf.data files could come from different binaries, the symbols addresses could vary. So perf diff is based on the comparison of the files and symbols name. OPTIONS ------- -D:: --dump-raw-trace:: Dump raw trace in ASCII. --kallsyms=:: kallsyms pathname -m:: --modules:: Load module symbols. WARNING: use only with -k and LIVE kernel -d:: --dsos=:: Only consider symbols in these dsos. CSV that understands file://filename entries. This option will affect the percentage of the Baseline/Delta column. See --percentage for more info. -C:: --comms=:: Only consider symbols in these comms. CSV that understands file://filename entries. This option will affect the percentage of the Baseline/Delta column. See --percentage for more info. -S:: --symbols=:: Only consider these symbols. CSV that understands file://filename entries. This option will affect the percentage of the Baseline/Delta column. See --percentage for more info. -s:: --sort=:: Sort by key(s): pid, comm, dso, symbol, cpu, parent, srcline. Please see description of --sort in the perf-report man page. -t:: --field-separator=:: Use a special separator character and don't pad with spaces, replacing all occurrences of this separator in symbol names (and other output) with a '.' character, that thus it's the only non valid separator. -v:: --verbose:: Be verbose, for instance, show the raw counts in addition to the diff. -f:: --force:: Don't do ownership validation. --symfs=:: Look for files with symbols relative to this directory. -b:: --baseline-only:: Show only items with match in baseline. -c:: --compute:: Differential computation selection - delta,ratio,wdiff (default is delta). See COMPARISON METHODS section for more info. -p:: --period:: Show period values for both compared hist entries. -F:: --formula:: Show formula for given computation. -o:: --order:: Specify compute sorting column number. --percentage:: Determine how to display the overhead percentage of filtered entries. Filters can be applied by --comms, --dsos and/or --symbols options. "relative" means it's relative to filtered entries only so that the sum of shown entries will be always 100%. "absolute" means it retains the original value before and after the filter is applied. COMPARISON ---------- The comparison is governed by the baseline file. The baseline perf.data file is iterated for samples. All other perf.data files specified on the command line are searched for the baseline sample pair. If the pair is found, specified computation is made and result is displayed. All samples from non-baseline perf.data files, that do not match any baseline entry, are displayed with empty space within baseline column and possible computation results (delta) in their related column. Example files samples: - file A with samples f1, f2, f3, f4, f6 - file B with samples f2, f4, f5 - file C with samples f1, f2, f5 Example output: x - computation takes place for pair b - baseline sample percentage - perf diff A B C baseline/A compute/B compute/C samples --------------------------------------- b x f1 b x x f2 b f3 b x f4 b f6 x x f5 - perf diff B A C baseline/B compute/A compute/C samples --------------------------------------- b x x f2 b x f4 b x f5 x x f1 x f3 x f6 - perf diff C B A baseline/C compute/B compute/A samples --------------------------------------- b x f1 b x x f2 b x f5 x f3 x x f4 x f6 COMPARISON METHODS ------------------ delta ~~~~~ If specified the 'Delta' column is displayed with value 'd' computed as: d = A->period_percent - B->period_percent with: - A/B being matching hist entry from data/baseline file specified (or perf.data/perf.data.old) respectively. - period_percent being the % of the hist entry period value within single data file - with filtering by -C, -d and/or -S, period_percent might be changed relative to how entries are filtered. Use --percentage=absolute to prevent such fluctuation. ratio ~~~~~ If specified the 'Ratio' column is displayed with value 'r' computed as: r = A->period / B->period with: - A/B being matching hist entry from data/baseline file specified (or perf.data/perf.data.old) respectively. - period being the hist entry period value wdiff:WEIGHT-B,WEIGHT-A ~~~~~~~~~~~~~~~~~~~~~~~ If specified the 'Weighted diff' column is displayed with value 'd' computed as: d = B->period * WEIGHT-A - A->period * WEIGHT-B - A/B being matching hist entry from data/baseline file specified (or perf.data/perf.data.old) respectively. - period being the hist entry period value - WEIGHT-A/WEIGHT-B being user supplied weights in the the '-c' option behind ':' separator like '-c wdiff:1,2'. - WEIGHT-A being the weight of the data file - WEIGHT-B being the weight of the baseline data file SEE ALSO -------- linkperf:perf-record[1], linkperf:perf-report[1] f1c4615cc2f576d0604406cdf0065f00b83b'>7c2cf1c4615cc2f576d0604406cdf0065f00b83b (diff)
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto fixes from Herbert Xu: - use-after-free in algif_aead - modular aesni regression when pcbc is modular but absent - bug causing IO page faults in ccp - double list add in ccp - NULL pointer dereference in qat (two patches) - panic in chcr - NULL pointer dereference in chcr - out-of-bound access in chcr * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: crypto: chcr - Fix key length for RFC4106 crypto: algif_aead - Fix kernel panic on list_del crypto: aesni - Fix failure when pcbc module is absent crypto: ccp - Fix double add when creating new DMA command crypto: ccp - Fix DMA operations when IOMMU is enabled crypto: chcr - Check device is allocated before use crypto: chcr - Fix panic on dma_unmap_sg crypto: qat - zero esram only for DH85x devices crypto: qat - fix bar discovery for c62x
Diffstat (limited to 'include/uapi/sound/Kbuild')