- 23 Mar, 2015 1 commit
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Jiri Olsa authored
Replacing the file name parsing with kmod_path__parse and moving the dso update into new separate function. Signed-off-by:
Jiri Olsa <jolsa@kernel.org> Acked-by:
Namhyung Kim <namhyung@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-q0ed76ajcyoaofotntrg5sla@git.kernel.orgSigned-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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- 22 Mar, 2015 2 commits
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Ingo Molnar authored
Merge tag 'perf-core-for-mingo-2' 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: - Handle legacy syscalls tracepoints (David Ahern, Arnaldo Carvalho de Melo) - Indicate which callchain entries are annotated in the TUI hists browser (report/top) (Arnaldo Carvalho de Melo) - Fix failure to add multiple probes without debuginfo (He Kuang) - Fix 'trace' summary_only option (David Ahern) - Fix race in build_id_cache__add_s() in 'buildid-cache' (Milos Vyletel) - Don't allow empty argument for field-separator, fixing segfault (Wang Nan) Infrastructure: - Add destructor for format_field in libtraceevent (David Ahern) - Prep work for support lzma compressed kernel modules (Jiri Olsa) - Update .gitignore with recently added/renamed feature detection files (Yunlong Song) Signed-off-by:
Ingo Molnar <mingo@kernel.org>
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Ingo Molnar authored
Merge tag 'perf-core-for-mingo' 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: User visible changes: - Bash completion for subcommands (Yunlong Song) - Allow annotating entries in callchains in the hists browser (top/report). TODO: give some visual cue to what entries in callchains have samples and thus can be annotated and/or allow showing the source code for functions without samples (Arnaldo Carvalho de Melo) - Don't allow empty argument for '-t' in perf report, fixing segfault (Wang Nan) Infrastructure: - Prep work for moving the perf feature tests build system to tools/build (Jiri Olsa) - Fix perf-read-vdsox32 not building and lib64 install dir (H.J. Lu) - ARM64: fix building error and eh/debug frame offset cache fixes (Wang Nan) Signed-off-by:
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- 21 Mar, 2015 15 commits
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Jiri Olsa authored
Using kmod_path__parse to get the module name and update the dso short name within machine__new_dso function. This way it's done only first time when dso is created, unlike the current way when we update it all the time we process memory map of the kernel module. Signed-off-by:
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Jiri Olsa authored
Separate the dso object addition and update when adding new kernel module. Currently we update dso's symtab_type any time we find it in the list, because we can't distinguish between new and found dso from __dsos__findnew function. Adding machine__module_dso that separates finding and adding new dso objects, so there's no superfluous update of dso. Signed-off-by:
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Jiri Olsa authored
Separate the creation of new dso object and its addition to the dsos list. It will be used in following patch. Signed-off-by:
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Jiri Olsa authored
Provides united way of parsing kernel module path into several components. The new kmod_path__parse function and few defines: int __kmod_path__parse(struct kmod_path *m, const char *path, bool alloc_name, bool alloc_ext); #define kmod_path__parse(__m, __p) __kmod_path__parse(__m, __p, false, false) #define kmod_path__parse_name(__m, __p) __kmod_path__parse(__m, __p, true , false) #define kmod_path__parse_ext(__m, __p) __kmod_path__parse(__m, __p, false, true) parse kernel module @path and updates @M argument like: @comp - true if @path contains supported compression suffix, false otherwise @kmod - true if @path contains '.ko' suffix in right position, false otherwise @name - if (@alloc_name && @kmod) is true, it contains strdup-ed base name of the kernel module without suffixes, otherwise strudup-ed base name of @path @ext - if (@alloc_ext && @comp) is true, it contains strdup-ed string the compression suffix It returns 0 if there's no strdup error, -ENOMEM otherwise. Signed-off-by: -
Jiri Olsa authored
In short, Fedora compresses kernel modules now (since version 21) with lzma compression. Adding lzma decompress support into the dso.c:compressions array introduced by Namhyung earlier. Signed-off-by:
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Jiri Olsa authored
Will be used to decompress 'xz' objects. The check detects the liblzma.so devel library normally delivered by xz package. Signed-off-by:
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David Ahern authored
Move the calls that frees the resources allocated for a struct format_field to a separate routine. Signed-off-by:
David Ahern <dsahern@gmail.com> Acked-by:
Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/1426790181-19118-1-git-send-email-dsahern@gmail.com [ Split this part from a larger patch, added pevent_ prefix as requested by Steven ] Signed-off-by:
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Arnaldo Carvalho de Melo authored
Now that we can annotate entries in a callchain, show which ones have an associated symbol and samples, by adding a right arrow just before the symbol name when in verbose mode. To toggle verbose mode press 'V'. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: David Ahern <dsahern@gmail.com> Cc: Don Zickus <dzickus@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-d2rf1p3h5gdp7hdl2gf2bozl@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
Currently the code skips the first field with the expectation that it is 'nr'. But older kernels do not have the 'nr' field: field:int nr; offset:8; size:4; signed:1; Change perf-trace to drop the field if it exists after parsing the format file. This fixes the off-by-one problem with older kernels (e.g., RHEL6). e.g, perf-trace shows this for write: 1.515 ( 0.006 ms): dd/4245 write(buf: 2</dev/pts/0>, count: 140733837536224 ) = 26 where 2 is really the fd, the huge number is really the buf address, etc. With this patch you get the more appropriate: 1.813 ( 0.003 ms): dd/6330 write(fd: 2</dev/pts/0>, buf: 0x7fff22fc81f0, count: 25) = 25 Based-on-a-patch-by: -
Jiri Olsa authored
Moving feature checks code under tools/build directory. Changing also $feature_dir to point to new feature directory location and perf Makefiles to include Makefile.feature from new location. Signed-off-by:
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Jiri Olsa authored
Putting feature checks directory into $feature_dir, so it's easy to configure when we move it to bools/build later. Signed-off-by:
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Jiri Olsa authored
Move feature related code into separate makefile. The new Makefile.feature is included from config/Makefile. It will be moved later into tools/build. Signed-off-by:
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Jiri Olsa authored
We have 2 feature_check functions, which conflict with each other. Fixing it by renaming the latter to feature_display_check. Signed-off-by:
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David Ahern authored
The intent of the -s/--summary-only option is to just show a summary of the system calls and statistics without any of the individual events. Commit e596663e broke that by showing the interrupted lines: perf trace -i perf.data -s ... 0.741 ( 0.000 ms): sleep/31316 fstat(fd: 4, statbuf: 0x7ffc75ceb830 ) ... 0.744 ( 0.000 ms): sleep/31316 mmap(len: 100244, prot: READ, flags: PRIVATE, fd: 4 ) ... 0.747 ( 0.000 ms): perf/31315 write(fd: 3, buf: 0x7d4bb0, count: 8 ) ... ... Fix by checking for the summary only option. Signed-off-by:
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He Kuang authored
Perf tries to find probe function addresses from map when debuginfo could not be found. To the first added function, the value of ref_reloc_sym was set in maps__set_kallsyms_ref_reloc_sym() and can be obtained from host_machine->kmaps->maps. After that, new maps are added to host_machine->kmaps->maps in dso__load_kcore(), all these new added maps do not have a valid ref_reloc_sym. When adding a second function, get_target_map() may get a map without valid ref_reloc_sym, and raise the error "Relocated base symbol is not found". Fix this by using kernel_get_ref_reloc_sym() to get ref_reloc_sym. This problem can be reproduced as following: $ perf probe --add='sys_write' --add='sys_open' Relocated base symbol is not found! Error: Failed to add events. After this patch: $ perf probe --add='sys_write' --add='sys_open' Added new event: probe:sys_write (on sys_write) You can now use it in all perf tools, such as: perf record -e probe:sys_write -aR sleep 1 Added new event: probe:sys_open (on sys_open) You can now use it in all perf tools, such as: perf record -e probe:sys_open -aR sleep 1 Signed-off-by:He Kuang <hekuang@huawei.com> Tested-by:
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/1426816616-2394-1-git-send-email-hekuang@huawei.comSigned-off-by:
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- 20 Mar, 2015 4 commits
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Yunlong Song authored
They are all auto-generated files during the perf building. Before this patch: $ git status Untracked files: (use "git add <file>..." to include in what will be committed) config/feature-checks/test-all.make.output config/feature-checks/test-backtrace.make.output config/feature-checks/test-bionic.make.output config/feature-checks/test-dwarf.make.output config/feature-checks/test-fortify-source.make.output config/feature-checks/test-glibc.make.output config/feature-checks/test-gtk2-infobar.make.output config/feature-checks/test-gtk2.make.output config/feature-checks/test-libaudit.make.output config/feature-checks/test-libbabeltrace.make.output config/feature-checks/test-libbfd.make.output config/feature-checks/test-libdw-dwarf-unwind.make.output config/feature-checks/test-libelf-getphdrnum.make.output config/feature-checks/test-libelf-mmap.make.output config/feature-checks/test-libelf.make.output config/feature-checks/test-libnuma.make.output config/feature-checks/test-libperl.make.output config/feature-checks/test-libpython-version.make.output config/feature-checks/test-libpython.make.output config/feature-checks/test-libslang.make.output config/feature-checks/test-libunwind.make.output config/feature-checks/test-pthread-attr-setaffinity-np.make.output config/feature-checks/test-stackprotector-all.make.output config/feature-checks/test-sync-compare-and-swap.make.output config/feature-checks/test-timerfd.make.output config/feature-checks/test-zlib.make.output After this patch: $ git status nothing to commit, working directory clean Signed-off-by:
Yunlong Song <yunlong.song@huawei.com> Tested-by:
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Yunlong Song authored
Since commit 4ae61202 ("perf build: Rename PERF-FEATURES into FEATURE-DUMP") renames PERF-FEATURES into FEATURE-DUMP, the .gitignore file should also do this thing for consistency. Signed-off-by:
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Wang Nan authored
Both 'perf diff' and 'perf mem' have 'field-separator' option, which causes segfault if passed with empty string. This patch uses previously introduced 'OPT_STRING_NOEMPTY' option macro to prevent fault. Signed-off-by:
Wang Nan <wangnan0@huawei.com> Tested-by:
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Milos Vyletel authored
int build_id_cache__add_s(const char *sbuild_id, const char *debugdir, const char *name, bool is_kallsyms, bool is_vdso) { ... if (access(filename, F_OK)) { ^--------------------------------------------------------- [1] if (is_kallsyms) { if (copyfile("/proc/kallsyms", filename)) goto out_free; } else if (link(realname, filename) && copyfile(name, filename)) ^-----------------------------^------------- [2] \------------ [3] goto out_free; } ... When multiple instances of perf record get to [1] at more or less same time and run access() one or more may get failure because the file does not exist yet (since the first instance did not have chance to link it yet). At this point the race moves to link() at [2] where first thread to get there links file and goes on but second one gets -EEXIST so it runs copyfile [3] which truncates the file. reproducer: rm -rf /root/.debug for cpu in $(awk '/processor/ {print $3}' /proc/cpuinfo); do perf record -a -v -T -F 1000 -C $cpu \ -o perf-${cpu}.data sleep 5 2> /dev/null & done wait and simply search for empty files by: find /lib/modules/`uname -r`/kernel/* -size 0 Signed-off-by:Milos Vyletel <milos@redhat.com> Acked-by:
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- 19 Mar, 2015 16 commits
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Wang Nan authored
Without this patch, perf report cause segfault if pass "" as '-t': $ perf report -t "" # To display the perf.data header info, please use --header/--header-only options. # # Samples: 37 of event 'syscalls:sys_enter_write' # Event count (approx.): 37 # # Children SelfCommand Shared Object Symbol Segmentation fault Since -t is used to add field-separator for generate table, -t "" is actually meanless. This patch defines a new OPT_STRING_NOEMPTY() option generator to ensure user never pass empty string to that option. Signed-off-by:
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Wang Nan authored
Commit f1f13af9 ("perf callchain: Cache eh/debug frame offset for dwarf unwind") introduces a cache for .debug_frame and .eh_frame_hdr. Unfortunately, it makes them share a same cache (dso->frame_offset). Which causes unwind failure on ARM: $ perf test unwind Test dwarf unwind: FAILED! The reason is that, if a dso has '.debug_frame' but doesn't have '.eh_frame_hdr' (like ARM), dso->frame_offset will be filled by offset of '.debug_frame' during the first time calling of find_proc_info() -> read_unwind_spec_debug_frame(), and be regarded to '.eh_frame_hdr' when the second time calling of find_proc_info() -> read_unwind_spec_eh_frame(), since '.eh_frame_hdr' is checked prior to '.debug_frame'. This patch solves the problem by creating two cache fields for '.eh_frame_hdr' and '.debug_frame'. Signed-off-by:
Jiri Olsa <jolsa@redhat.com> Acked-by:
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Yunlong Song authored
Since some functions (e.g. '_get_comp_words_by_ref()') in perf bash completion script are originally taken from git bash completion script, these functions may be preloaded before perf bash completion script runs. In order to avoid repeating loading the same function twice, some test constraints are used before these function definitions in the perf bash completion script (e.g. 'type _get_comp_words_by_ref &>/dev/null ||'). The problem is that, if these functions in perf bash completion script are changed for some reason, perf will still use the preloaded bash functions rather than the customized functions of its own. As a result, the perf bash completion will behave incorrectly. To get rid of this problem, a flag can be defined to determine the proper situation. And to avoid overwriting the preloaded functions, the names of these functions in perf bash completion script should be renamed to the perf-customized ones. Example: Before this patch: $ type _get_comp_words_by_ref _get_comp_words_by_ref is a function _get_comp_words_by_ref () { local exclude flag i OPTIND=1; local cur cword words=(); local upargs=() upvars=() vcur vcword vprev vwords; while getopts "c:i:n:p:w:" flag "$@"; do case $flag in c) vcur=$OPTARG ;; i) vcword=$OPTARG ;; n) exclude=$OPTARG ;; p) vprev=$OPTARG ;; w) vwords=$OPTARG ;; esac; done; while [[ $# -ge $OPTIND ]]; do case ${!OPTIND} in cur) vcur=cur ;; prev) vprev=prev ;; cword) vcword=cword ;; words) vwords=words ;; *) echo "bash: $FUNCNAME(): \`${!OPTIND}': unknown argument" 1>&2; return 1 ;; esac; let "OPTIND += 1"; done; __get_cword_at_cursor_by_ref "$exclude" words cword cur; [[ -n $vcur ]] && { upvars+=("$vcur"); upargs+=(-v $vcur "$cur") }; [[ -n $vcword ]] && { upvars+=("$vcword"); upargs+=(-v $vcword "$cword") }; [[ -n $vprev && $cword -ge 1 ]] && { upvars+=("$vprev"); upargs+=(-v $vprev "${words[cword - 1]}") }; [[ -n $vwords ]] && { upvars+=("$vwords"); upargs+=(-a${#words[@]} $vwords "${words[@]}") }; (( ${#upvars[@]} )) && local "${upvars[@]}" && _upvars "${upargs[@]}" } As shown above, the _get_comp_words_by_ref is the preloaded function in fact, rather than the function defined in perf-completion.sh. So if we happen to change the function for some reason, the result will behave in a wrong state. After this patch: We can set preload_get_comp_words_by_ref="false" to not use the preloaded function. Instead, it will use the function defined in perf-completion.sh, which is renamed as __perf_get_comp_words_by_ref to avoid overwriting the preloaded function _get_comp_words_by_ref. $ type __perf_get_comp_words_by_ref __perf_get_comp_words_by_ref is a function __perf_get_comp_words_by_ref () { local exclude cur_ words_ cword_; if [ "$1" = "-n" ]; then exclude=$2; shift 2; fi; __my_reassemble_comp_words_by_ref "$exclude"; cur_=${words_[cword_]}; while [ $# -gt 0 ]; do case "$1" in cur) cur=$cur_ ;; prev) prev=${words_[$cword_-1]} ;; words) words=("${words_[@]}") ;; cword) cword=$cword_ ;; esac; shift; done } As shown above, the function __perf_get_comp_words_by_ref is loaded and can work this time. Note that we do not change the original behavior when those functions are not preloaded before perf bash completion script runs. In this case, although the flag is set to "true", the code will still change it to "false" to use the function defined in perf-completion.sh. Signed-off-by: -
Yunlong Song authored
The bash completion does not support listing subsubcommands for 'perf trace <TAB>', so fix it. Example: Before this patch: $ perf trace <TAB> $ As shown above, the subsubcommands of perf trace does not come out. After this patch: $ perf trace <TAB> record As shown above, the subsubcommands of perf trace can come out now. Signed-off-by:
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Yunlong Song authored
The bash completion does not support listing subsubcommands for 'perf timechart <TAB>', so fix it. Example: Before this patch: $ perf timechart <TAB> $ As shown above, the subsubcommands of perf timechart does not come out. After this patch: $ perf timechart <TAB> record As shown above, the subsubcommands of perf timechart can come out now. Signed-off-by:
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Yunlong Song authored
The bash completion does not support listing subsubcommands for 'perf test <TAB>', so fix it. Example: Before this patch: $ perf test <TAB> $ As shown above, the subsubcommands of perf test does not come out. After this patch: $ perf test <TAB> list As shown above, the subsubcommands of perf test can come out now. Signed-off-by:
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Yunlong Song authored
The bash completion does not support listing subsubcommands for 'perf script <TAB>', so fix it. Example: Before this patch: $ perf script <TAB> $ As shown above, the subsubcommands of perf script does not come out. After this patch: $ perf script <TAB> record report As shown above, the subsubcommands of perf script can come out now. Signed-off-by:
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Yunlong Song authored
The bash completion does not support listing subsubcommands for 'perf help <TAB>', so fix it. Example: Before this patch: $ perf help <TAB> $ As shown above, the subsubcommands of perf help does not come out. After this patch: $ perf help <TAB> annotate buildid-cache data evlist inject kvm lock probe report script test top bench buildid-list diff help kmem list mem record sched stat timechart trace As shown above, the subsubcommands of perf help can come out now. Signed-off-by:
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Yunlong Song authored
The bash completion does not support listing subsubcommands for 'perf data <TAB>', so fix it. Example: Before this patch: $ perf data <TAB> $ As shown above, the subsubcommands of perf data does not come out. After this patch: $ perf data <TAB> convert As shown above, the subsubcommands of perf data can come out now. Signed-off-by:
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Yunlong Song authored
The bash completion does not support listing subcommands for 'perf --<long option> <TAB>'. Example: Before this patch: $ perf --debug <TAB> $ As shown above, the subcommands of perf does not come out. After this patch: $ perf --debug <TAB> annotate buildid-cache data evlist inject kvm lock probe report script test top version bench buildid-list diff help kmem list mem record sched stat timechart trace As shown above, the subcommands of perf can come out now. Signed-off-by:
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Yunlong Song authored
The bash completion only supports -e rather than --event, so fix it. Example: Before this patch: $ perf record --event <TAB> $ As shown above, the events of record does not come out. After this patch: $ perf record --event <TAB> lignment-faults cpu/instructions/ L1-dcache-prefetch-misses node-prefetches uncore_rbox_0/qpi0_idle_filt/ branch-instructions cpu/mem-loads/ L1-dcache-store-misses node-prefetch-misses uncore_rbox_0/qpi1_date_response/ branch-load-misses cpu-migrations L1-dcache-stores node-store-misses uncore_rbox_0/qpi1_filt_send/ branch-loads dTLB-load-misses L1-icache-load-misses node-stores uncore_rbox_0/qpi1_idle_filt/ ... As shown above, the events of record can come out now. Signed-off-by:
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Yunlong Song authored
The bash completion does not support listing events for 'perf kvm|kmem| mem|lock|sched record|stat|top -e <TAB>', where 'kvm|kmem|mem|lock|sched' are all subcommands of perf. Example: Before this patch: $ perf kvm record -e <TAB> $ As shown above, the events of record does not come out. After this patch: $ perf kvm record -e <TAB> alignment-faults cpu/instructions/ L1-dcache-prefetch-misses node-prefetches uncore_rbox_0/qpi0_idle_filt/ branch-instructions cpu/mem-loads/ L1-dcache-store-misses node-prefetch-misses uncore_rbox_0/qpi1_date_response/ branch-load-misses cpu-migrations L1-dcache-stores node-store-misses uncore_rbox_0/qpi1_filt_send/ branch-loads dTLB-load-misses L1-icache-load-misses node-stores uncore_rbox_0/qpi1_idle_filt/ ... As shown above, the events of record can come out now. Signed-off-by:
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Yunlong Song authored
The bash completion gives wrong options for 'perf kvm|kmem|mem|lock| sched subsubcommand --<TAB>', where 'kvm|kmem|mem|lock|sched' are all subcommands of perf and 'subsubcommand' is a subcommand of 'kvm|kmem|mem |lock|sched'. In fact, the result incorrectly lists the bash completion of 'perf subcommand' rather than 'perf subcommand subsubcommand'. Example: Before this patch: $ perf kvm record --<TAB> --guest --guestkallsyms --guestmodules --guestmount --guestvmlinux --host --input --output --verbose As shown above, the result is the options of kvm rather than record. After this patch: $ perf kvm record --<TAB> --all-cpus --cgroup --delay --group --no-buildid --output --quiet --stat --uid --branch-any --count --event --intr-regs --no-buildid-cache --period --raw-samples --tid --verbose --branch-filter --cpu --filter --mmap-pages --no-inherit --per-thread --realtime --timestamp --weight --call-graph --data --freq --no-buffering --no-samples --pid --running-time --transaction As shown above, the result is exactly the options of record as we wished. Signed-off-by:
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Yunlong Song authored
The bash completion does not support listing subsubcommands for 'perf kvm|kmem|mem|lock|sched --<long option> <TAB>', where 'kvm|kmem|mem| lock|sched' are all subcommands of perf. Example: Before this patch: $ perf kvm --verbose <TAB> $ As shown above, the subsubcommands of perf kvm does not come out. After this patch: $ perf kvm --verbose <TAB> buildid-list diff record report stat top As shown above, the subsubcommands of perf kvm can come out now. Signed-off-by:
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Yunlong Song authored
The bash completion does not support listing options for 'perf kvm|kmem|mem|lock|sched --<TAB>', where 'kvm|kmem|mem|lock|sched' are all subcommands of perf. Example: Before this patch: $ perf kvm --<TAB> $ As shown above, the options of perf kvm does not come out. After this patch: $ perf kvm --<TAB> --alloc --caller --input --line --raw-ip --sort --verbose As shown above, the options of perf kvm can come out now. Signed-off-by:
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H.J. Lu authored
Commit: c6e5e9fb ("perf tools: Fix building error in x86_64 when dwarf unwind is on") removed the definition of IS_X86_64 but not all places using it, with the consequence that perf-read-vdsox32 would not be built anymore, and the default lib install directory was 'lib' instead of 'lib64'. Also needs to go to v3.19. Signed-off-by:
H.J. Lu <hjl.tools@gmail.com> Acked-by:
Adrian Hunter <adrian.hunter@intel.com> Acked-by:
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- 18 Mar, 2015 2 commits
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Jiri Olsa authored
As it has nothing to do with features and won't be moved into tools/build. Signed-off-by:
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Jiri Olsa authored
Preparing for feature checks separation, moving related stuff under 'FEATURE*' namespace. Signed-off-by:
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