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a54ca19498
After the commit ffd3d18c20b8 ("perf tools: Add ARM Statistical
Profiling Extensions (SPE) support") has been merged, it supports to
output raw data with option "--dump-raw-trace". However, it misses for
support synthetic events so cannot output any statistical info.
This patch is to improve the "perf report" support for ARM SPE for four
types synthetic events:
First level cache synthetic events, including L1 data cache accessing
and missing events;
Last level cache synthetic events, including last level cache
accessing and missing events;
TLB synthetic events, including TLB accessing and missing events;
Remote access events, which is used to account load/store operations
caused to another socket.
Example usage:
$ perf record -c 1024 -e arm_spe_0/branch_filter=1,ts_enable=1,pct_enable=1,pa_enable=1,load_filter=1,jitter=1,store_filter=1,min_latency=0/ dd if=/dev/zero of=/dev/null count=10000
$ perf report --stdio
# Samples: 59 of event 'l1d-miss'
# Event count (approx.): 59
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ................. ..................................
#
23.73% 23.73% dd [kernel.kallsyms] [k] perf_iterate_ctx.constprop.135
20.34% 20.34% dd [kernel.kallsyms] [k] filemap_map_pages
5.08% 5.08% dd [kernel.kallsyms] [k] perf_event_mmap
5.08% 5.08% dd [kernel.kallsyms] [k] unlock_page_memcg
5.08% 5.08% dd [kernel.kallsyms] [k] unmap_page_range
3.39% 3.39% dd [kernel.kallsyms] [k] PageHuge
3.39% 3.39% dd [kernel.kallsyms] [k] release_pages
3.39% 3.39% dd ld-2.28.so [.] 0x0000000000008b5c
1.69% 1.69% dd [kernel.kallsyms] [k] __alloc_fd
[...]
# Samples: 3K of event 'l1d-access'
# Event count (approx.): 3980
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ................. ......................................
#
26.98% 26.98% dd [kernel.kallsyms] [k] ret_to_user
10.53% 10.53% dd [kernel.kallsyms] [k] fsnotify
7.51% 7.51% dd [kernel.kallsyms] [k] new_sync_read
4.57% 4.57% dd [kernel.kallsyms] [k] vfs_read
4.35% 4.35% dd [kernel.kallsyms] [k] vfs_write
3.69% 3.69% dd [kernel.kallsyms] [k] __fget_light
3.69% 3.69% dd [kernel.kallsyms] [k] rw_verify_area
3.44% 3.44% dd [kernel.kallsyms] [k] security_file_permission
2.76% 2.76% dd [kernel.kallsyms] [k] __fsnotify_parent
2.44% 2.44% dd [kernel.kallsyms] [k] ksys_write
2.24% 2.24% dd [kernel.kallsyms] [k] iov_iter_zero
2.19% 2.19% dd [kernel.kallsyms] [k] read_iter_zero
1.81% 1.81% dd dd [.] 0x0000000000002960
1.78% 1.78% dd dd [.] 0x0000000000002980
[...]
# Samples: 35 of event 'llc-miss'
# Event count (approx.): 35
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ................. ...........................
#
34.29% 34.29% dd [kernel.kallsyms] [k] filemap_map_pages
8.57% 8.57% dd [kernel.kallsyms] [k] unlock_page_memcg
8.57% 8.57% dd [kernel.kallsyms] [k] unmap_page_range
5.71% 5.71% dd [kernel.kallsyms] [k] PageHuge
5.71% 5.71% dd [kernel.kallsyms] [k] release_pages
5.71% 5.71% dd ld-2.28.so [.] 0x0000000000008b5c
2.86% 2.86% dd [kernel.kallsyms] [k] __queue_work
2.86% 2.86% dd [kernel.kallsyms] [k] __radix_tree_lookup
2.86% 2.86% dd [kernel.kallsyms] [k] copy_page
[...]
# Samples: 2 of event 'llc-access'
# Event count (approx.): 2
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ................. .............
#
50.00% 50.00% dd [kernel.kallsyms] [k] copy_page
50.00% 50.00% dd libc-2.28.so [.] _dl_addr
# Samples: 48 of event 'tlb-miss'
# Event count (approx.): 48
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ................. ..................................
#
20.83% 20.83% dd [kernel.kallsyms] [k] perf_iterate_ctx.constprop.135
12.50% 12.50% dd [kernel.kallsyms] [k] __arch_clear_user
10.42% 10.42% dd [kernel.kallsyms] [k] clear_page
4.17% 4.17% dd [kernel.kallsyms] [k] copy_page
4.17% 4.17% dd [kernel.kallsyms] [k] filemap_map_pages
2.08% 2.08% dd [kernel.kallsyms] [k] __alloc_fd
2.08% 2.08% dd [kernel.kallsyms] [k] __mod_memcg_state.part.70
2.08% 2.08% dd [kernel.kallsyms] [k] __queue_work
2.08% 2.08% dd [kernel.kallsyms] [k] __rcu_read_unlock
2.08% 2.08% dd [kernel.kallsyms] [k] d_path
2.08% 2.08% dd [kernel.kallsyms] [k] destroy_inode
2.08% 2.08% dd [kernel.kallsyms] [k] do_dentry_open
[...]
# Samples: 9K of event 'tlb-access'
# Event count (approx.): 9573
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ................. ......................................
#
25.79% 25.79% dd [kernel.kallsyms] [k] __arch_clear_user
11.22% 11.22% dd [kernel.kallsyms] [k] ret_to_user
8.56% 8.56% dd [kernel.kallsyms] [k] fsnotify
4.06% 4.06% dd [kernel.kallsyms] [k] new_sync_read
3.67% 3.67% dd [kernel.kallsyms] [k] el0_svc_common.constprop.2
3.04% 3.04% dd [kernel.kallsyms] [k] __fsnotify_parent
2.90% 2.90% dd [kernel.kallsyms] [k] vfs_write
2.82% 2.82% dd [kernel.kallsyms] [k] vfs_read
2.52% 2.52% dd libc-2.28.so [.] write
2.26% 2.26% dd [kernel.kallsyms] [k] security_file_permission
2.08% 2.08% dd [kernel.kallsyms] [k] ksys_write
1.96% 1.96% dd [kernel.kallsyms] [k] rw_verify_area
1.95% 1.95% dd [kernel.kallsyms] [k] read_iter_zero
[...]
# Samples: 9 of event 'branch-miss'
# Event count (approx.): 9
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ................. .........................
#
22.22% 22.22% dd libc-2.28.so [.] _dl_addr
11.11% 11.11% dd [kernel.kallsyms] [k] __arch_clear_user
11.11% 11.11% dd [kernel.kallsyms] [k] __arch_copy_from_user
11.11% 11.11% dd [kernel.kallsyms] [k] __dentry_kill
11.11% 11.11% dd [kernel.kallsyms] [k] __efistub_memcpy
11.11% 11.11% dd ld-2.28.so [.] 0x0000000000012b7c
11.11% 11.11% dd libc-2.28.so [.] 0x000000000002a980
11.11% 11.11% dd libc-2.28.so [.] 0x0000000000083340
# Samples: 29 of event 'remote-access'
# Event count (approx.): 29
#
# Children Self Command Shared Object Symbol
# ........ ........ ....... ................. ...........................
#
41.38% 41.38% dd [kernel.kallsyms] [k] filemap_map_pages
10.34% 10.34% dd [kernel.kallsyms] [k] unlock_page_memcg
10.34% 10.34% dd [kernel.kallsyms] [k] unmap_page_range
6.90% 6.90% dd [kernel.kallsyms] [k] release_pages
3.45% 3.45% dd [kernel.kallsyms] [k] PageHuge
3.45% 3.45% dd [kernel.kallsyms] [k] __queue_work
3.45% 3.45% dd [kernel.kallsyms] [k] page_add_file_rmap
3.45% 3.45% dd [kernel.kallsyms] [k] page_counter_try_charge
3.45% 3.45% dd [kernel.kallsyms] [k] page_remove_rmap
3.45% 3.45% dd [kernel.kallsyms] [k] xas_start
3.45% 3.45% dd ld-2.28.so [.] 0x0000000000002a1c
3.45% 3.45% dd ld-2.28.so [.] 0x0000000000008b5c
3.45% 3.45% dd ld-2.28.so [.] 0x00000000000093cc
Signed-off-by: Tan Xiaojun <tanxiaojun@huawei.com>
Tested-by: James Clark <james.clark@arm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Al Grant <al.grant@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lore.kernel.org/lkml/20200530122442.490-4-leo.yan@linaro.org
Signed-off-by: James Clark <james.clark@arm.com>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.