* [lkp] [+1015 bytes kernel size regression] [i386-tinyconfig] [37f7dceb4b] perf: attach/detach PMU specific data
@ 2020-01-10 14:12 kbuild test robot
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From: kbuild test robot @ 2020-01-10 14:12 UTC (permalink / raw)
To: kbuild-all
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FYI, we noticed a +1015 bytes kernel size regression due to commit:
commit: 37f7dceb4b8c6c07560a7a2eebe3000ea63d790f (perf: attach/detach PMU specific data)
url: https://github.com/0day-ci/linux/commits/kan-liang-linux-intel-com/perf-Save-PMU-specific-data-in-task_struct/20200110-042221
Details as below (size data is obtained by `nm --size-sort vmlinux`):
b69ecfbc: perf: Save PMU specific data in task_struct
37f7dceb: perf: attach/detach PMU specific data
+------------------------------------+----------+----------+-------+
| symbol | b69ecfbc | 37f7dceb | delta |
+------------------------------------+----------+----------+-------+
| nm.t.perf_event_alloc | 1559 | 2071 | 512 |
| bzImage | 440272 | 440784 | 512 |
| nm.t._free_event | 410 | 547 | 137 |
| nm.T.perf_event_fork | 20 | 125 | 105 |
| nm.t.alloc_perf_ctx_data | 0 | 70 | 70 |
| nm.t.detach_task_ctx_data | 0 | 65 | 65 |
| nm.t.detach_task_ctx_data_sys_wide | 0 | 61 | 61 |
| nm.t.free_perf_ctx_data | 0 | 19 | 19 |
| nm.T.perf_event_exit_task | 583 | 596 | 13 |
| nm.T.ring_buffer_put | 31 | 38 | 7 |
| nm.t.perf_read | 474 | 481 | 7 |
| nm.t.put_ctx | 62 | 67 | 5 |
| nm.t.find_get_context | 361 | 366 | 5 |
| nm.t.inherit_event | 377 | 382 | 5 |
| nm.b.nr_task_data_sys_wide_events | 0 | 4 | 4 |
| nm.t.free_perf_ctx_data_rcu | 0 | 2 | 2 |
| nm.t.kzalloc | 10 | 8 | -2 |
+------------------------------------+----------+----------+-------+
Thanks,
Kbuild test robot
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2020-01-10 14:12 [lkp] [+1015 bytes kernel size regression] [i386-tinyconfig] [37f7dceb4b] perf: attach/detach PMU specific data kbuild test robot
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