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perf kwork: Implement 'report' subcommand
Implements framework of 'perf kwork report', which is used to report
time properties such as run time and frequency:
Test cases:
# perf kwork
Usage: perf kwork [<options>] {record|report}
-D, --dump-raw-trace dump raw trace in ASCII
-f, --force don't complain, do it
-k, --kwork <kwork> list of kwork to profile (irq, softirq, workqueue, etc)
-v, --verbose be more verbose (show symbol address, etc)
# perf kwork report -h
Usage: perf kwork report [<options>]
-C, --cpu <cpu> list of cpus to profile
-i, --input <file> input file name
-n, --name <name> event name to profile
-s, --sort <key[,key2...]>
sort by key(s): runtime, max, count
-S, --with-summary Show summary with statistics
--time <str> Time span for analysis (start,stop)
# perf kwork report
Kwork Name | Cpu | Total Runtime | Count | Max runtime | Max runtime start | Max runtime end |
--------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------------------------------------------------
# perf kwork report -S
Kwork Name | Cpu | Total Runtime | Count | Max runtime | Max runtime start | Max runtime end |
--------------------------------------------------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------------------------------------------------
Total count : 0
Total runtime (msec) : 0.000 (0.000% load average)
Total time span (msec) : 0.000
--------------------------------------------------------------------------------------------------------------------------------
# perf kwork report -C 0,100
Requested CPU 100 too large. Consider raising MAX_NR_CPUS
Invalid cpu bitmap
# perf kwork report -s runtime1
Error: Unknown --sort key: `runtime1'
Usage: perf kwork report [<options>]
-C, --cpu <cpu> list of cpus to profile
-i, --input <file> input file name
-n, --name <name> event name to profile
-s, --sort <key[,key2...]>
sort by key(s): runtime, max, count
-S, --with-summary Show summary with statistics
--time <str> Time span for analysis (start,stop)
# perf kwork report -i perf_no_exist.data
failed to open perf_no_exist.data: No such file or directory
# perf kwork report --time 00FFF,
Invalid time span
Since there are no report supported events, the output is empty.
Briefly describe the data structure:
1. "class" indicates event type. For example, irq and softiq correspond
to different types.
2. "cluster" refers to a specific event corresponding to a type. For
example, RCU and TIMER in softirq correspond to different clusters,
which contains three types of events: raise, entry, and exit.
3. "atom" includes time of each sample and sample of the previous phase.
(For example, exit corresponds to entry, which is used for timehist.)
Committer notes:
- Add {} for multiline if blocks.
- report_print_work() should either return that ret variable that
accounts how many bytes were printed or stop accounting and be void.
Do the former for now to avoid this:
builtin-kwork.c:534:6: error: variable 'ret' set but not used [-Werror,-Wunused-but-set-variable]
int ret = 0;
^
1 error generated.
When building with:
⬢[acme@toolbox perf]$ clang --version
clang version 13.0.0 (https://github.com/llvm/llvm-project e8991caea8690ec2d17b0b7e1c29bf0da6609076)
Also:
- if ((dst_type >= 0) && (dst_type < KWORK_TRACE_MAX)) {
+ if (dst_type < KWORK_TRACE_MAX) {
Several versions of clang and at least this gcc:
3 51.40 alpine:3.9 : FAIL gcc version 8.3.0 (Alpine 8.3.0)
builtin-kwork.c:411:16: error: comparison of unsigned enum expression >= 0 is
always true [-Werror,-Wtautological-compare]
if ((dst_type >= 0) && (dst_type < KWORK_TRACE_MAX)) {
As the first entry in a enum is zero.
Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Clarke <pc@us.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220709015033.38326-7-yangjihong1@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Yang Jihong
committed by
Arnaldo Carvalho de Melo
Arnaldo Carvalho de Melo
parent
e432947ef5
commit
f98919ec4f
@@ -17,8 +17,11 @@ There are several variants of 'perf kwork':
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'perf kwork record <command>' to record the kernel work
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of an arbitrary workload.
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'perf kwork report' to report the per kwork runtime.
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Example usage:
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perf kwork record -- sleep 1
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perf kwork report
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OPTIONS
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-------
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@@ -38,6 +41,36 @@ OPTIONS
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--verbose::
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Be more verbose. (show symbol address, etc)
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OPTIONS for 'perf kwork report'
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----------------------------
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-C::
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--cpu::
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Only show events for the given CPU(s) (comma separated list).
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-i::
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--input::
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Input file name. (default: perf.data unless stdin is a fifo)
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-n::
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--name::
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Only show events for the given name.
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-s::
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--sort::
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Sort by key(s): runtime, max, count
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-S::
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--with-summary::
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Show summary with statistics
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--time::
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Only analyze samples within given time window: <start>,<stop>. Times
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have the format seconds.microseconds. If start is not given (i.e., time
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string is ',x.y') then analysis starts at the beginning of the file. If
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stop time is not given (i.e, time string is 'x.y,') then analysis goes
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to end of file.
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SEE ALSO
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--------
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linkperf:perf-record[1]
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File diff suppressed because it is too large
Load Diff
@@ -19,6 +19,105 @@ enum kwork_class_type {
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KWORK_CLASS_MAX,
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};
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enum kwork_report_type {
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KWORK_REPORT_RUNTIME,
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};
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enum kwork_trace_type {
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KWORK_TRACE_ENTRY,
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KWORK_TRACE_EXIT,
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KWORK_TRACE_MAX,
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};
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/*
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* data structure:
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*
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* +==================+ +============+ +======================+
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* | class | | work | | atom |
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* +==================+ +============+ +======================+
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* +------------+ | +-----+ | | +------+ | | +-------+ +-----+ |
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* | perf_kwork | +-> | irq | --------|+-> | eth0 | --+-> | raise | - | ... | --+ +-----------+
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* +-----+------+ || +-----+ ||| +------+ ||| +-------+ +-----+ | | | |
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* | || ||| ||| | +-> | atom_page |
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* | || ||| ||| +-------+ +-----+ | | |
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* | class_list ||| |+-> | entry | - | ... | ----> | |
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* | || ||| ||| +-------+ +-----+ | | |
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* | || ||| ||| | +-> | |
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* | || ||| ||| +-------+ +-----+ | | | |
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* | || ||| |+-> | exit | - | ... | --+ +-----+-----+
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* | || ||| | | +-------+ +-----+ | |
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* | || ||| | | | |
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* | || ||| +-----+ | | | |
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* | || |+-> | ... | | | | |
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* | || | | +-----+ | | | |
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* | || | | | | | |
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* | || +---------+ | | +-----+ | | +-------+ +-----+ | |
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* | +-> | softirq | -------> | RCU | ---+-> | raise | - | ... | --+ +-----+-----+
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* | || +---------+ | | +-----+ ||| +-------+ +-----+ | | | |
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* | || | | ||| | +-> | atom_page |
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* | || | | ||| +-------+ +-----+ | | |
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* | || | | |+-> | entry | - | ... | ----> | |
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* | || | | ||| +-------+ +-----+ | | |
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* | || | | ||| | +-> | |
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* | || | | ||| +-------+ +-----+ | | | |
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* | || | | |+-> | exit | - | ... | --+ +-----+-----+
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* | || | | | | +-------+ +-----+ | |
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* | || | | | | | |
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* | || +-----------+ | | +-----+ | | | |
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* | +-> | workqueue | -----> | ... | | | | |
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* | | +-----------+ | | +-----+ | | | |
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* | +==================+ +============+ +======================+ |
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* | |
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* +----> atom_page_list ---------------------------------------------------------+
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*
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*/
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struct kwork_atom {
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struct list_head list;
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u64 time;
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struct kwork_atom *prev;
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void *page_addr;
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unsigned long bit_inpage;
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};
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#define NR_ATOM_PER_PAGE 128
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struct kwork_atom_page {
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struct list_head list;
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struct kwork_atom atoms[NR_ATOM_PER_PAGE];
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DECLARE_BITMAP(bitmap, NR_ATOM_PER_PAGE);
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};
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struct kwork_class;
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struct kwork_work {
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/*
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* class field
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*/
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struct rb_node node;
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struct kwork_class *class;
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/*
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* work field
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*/
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u64 id;
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int cpu;
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char *name;
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/*
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* atom field
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*/
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u64 nr_atoms;
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struct list_head atom_list[KWORK_TRACE_MAX];
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/*
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* runtime report
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*/
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u64 max_runtime;
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u64 max_runtime_start;
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u64 max_runtime_end;
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u64 total_runtime;
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};
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struct kwork_class {
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struct list_head list;
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const char *name;
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@@ -26,19 +125,81 @@ struct kwork_class {
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unsigned int nr_tracepoints;
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const struct evsel_str_handler *tp_handlers;
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struct rb_root_cached work_root;
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int (*class_init)(struct kwork_class *class,
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struct perf_session *session);
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void (*work_init)(struct kwork_class *class,
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struct kwork_work *work,
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struct evsel *evsel,
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struct perf_sample *sample,
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struct machine *machine);
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void (*work_name)(struct kwork_work *work,
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char *buf, int len);
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};
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struct perf_kwork;
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struct trace_kwork_handler {
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int (*entry_event)(struct perf_kwork *kwork,
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struct kwork_class *class, struct evsel *evsel,
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struct perf_sample *sample, struct machine *machine);
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int (*exit_event)(struct perf_kwork *kwork,
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struct kwork_class *class, struct evsel *evsel,
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struct perf_sample *sample, struct machine *machine);
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};
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struct perf_kwork {
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/*
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* metadata
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*/
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struct perf_tool tool;
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struct list_head class_list;
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struct list_head atom_page_list;
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struct list_head sort_list, cmp_id;
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struct rb_root_cached sorted_work_root;
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const struct trace_kwork_handler *tp_handler;
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/*
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* profile filters
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*/
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const char *profile_name;
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const char *cpu_list;
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DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
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const char *time_str;
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struct perf_time_interval ptime;
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/*
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* options for command
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*/
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bool force;
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const char *event_list_str;
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enum kwork_report_type report;
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/*
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* options for subcommand
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*/
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bool summary;
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const char *sort_order;
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/*
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* statistics
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*/
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u64 timestart;
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u64 timeend;
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unsigned long nr_events;
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unsigned long nr_lost_chunks;
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unsigned long nr_lost_events;
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u64 all_runtime;
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u64 all_count;
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u64 nr_skipped_events[KWORK_TRACE_MAX + 1];
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};
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#endif /* PERF_UTIL_KWORK_H */
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