62d7ae9234
Running perf on "gdb -nx -readnow -batch gdb", I'm seeing a lot of
time (24%.75!) spent in gettext, via complaints. 'perf report -g' shows:
- 86.23% 0.00% gdb gdb [.] gdb_main
- gdb_main
- 85.60% catch_command_errors
symbol_file_add_main_adapter
symbol_file_add_main
symbol_file_add_main_1
symbol_file_add
- symbol_file_add_with_addrs
- 84.31% dw2_expand_all_symtabs
- dw2_instantiate_symtab
- 83.79% dw2_do_instantiate_symtab
- 70.85% process_die
- 41.11% dwarf_decode_macros
- 41.09% dwarf_decode_macro_bytes
- 39.74% dwarf_decode_macro_bytes
>>>>>>>>>>>>>>>>>>>>>>> + 24.75% __dcigettext <<<<<<<
+ 7.37% macro_define_object_internal
+ 3.16% macro_define_function
0.77% splay_tree_insert
+ 0.76% savestring
+ 0.58% free
0.53% read_indirect_string_at_offset_from
0.54% macro_define_object_internal
0.51% macro_start_file
+ 25.57% process_die
+ 4.07% dwarf_decode_lines
+ 4.28% compute_delayed_physnames
+ 3.85% end_symtab_from_static_block
+ 3.38% load_cu
+ 1.29% end_symtab_get_static_block
+ 0.52% do_my_cleanups
+ 1.29% read_symbols
+ 0.54% gdb_init
The problem is that we're always computing the arguments to pass to
complaint, including passing the format strings through gettext, even
when complaints are disabled. As seen above, gettext can be quite
expensive.
Fix this by wrapping complaint in a macro that skips the real
complaint call when complaints are disabled.
This improves "gdb -nx -readnow -batch gdb" from
~11.0s => ~7.8s with -O2 -g3, and
~6.0s => ~5.3s with -O2 -g.
w/ gcc 5.3.1, on x86_64, for me.
gdb/ChangeLog:
2017-11-08 Pedro Alves <palves@redhat.com>
* complaints.c (stop_whining): Make extern.
(complaint): Rename to ...
(complaint_internal): ... this.
* complaints.h (complaint): Rename to ...
(complaint_internal): ... this.
(complaint): Reimplement as macro around complaint_internal.
gdb/testsuite/ChangeLog:
2017-11-08 Pedro Alves <palves@redhat.com>
* gdb.gdb/complaints.exp (test_initial_complaints)
(test_serial_complaints, test_short_complaints): Call
complaint_internal instead of complaint.
68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
/* Definitions for complaint handling during symbol reading in GDB.
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Copyright (C) 1990-2017 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#if !defined (COMPLAINTS_H)
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#define COMPLAINTS_H
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/* Opaque object used to track the number of complaints of a
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particular category. */
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struct complaints;
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/* Predefined categories. */
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extern struct complaints *symfile_complaints;
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/* Helper for complaint. */
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extern void complaint_internal (struct complaints **complaints,
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const char *fmt, ...)
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ATTRIBUTE_PRINTF (2, 3);
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/* Register a complaint. This is a macro around complaint_internal to
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avoid computing complaint's arguments when complaints are disabled.
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Running FMT via gettext [i.e., _(FMT)] can be quite expensive, for
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example. */
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#define complaint(COMPLAINTS, FMT, ...) \
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do \
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{ \
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extern int stop_whining; \
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\
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if (stop_whining > 0) \
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complaint_internal (COMPLAINTS, FMT, ##__VA_ARGS__); \
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} \
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while (0)
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extern void internal_complaint (struct complaints **complaints,
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const char *file, int line,
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const char *fmt,
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...) ATTRIBUTE_PRINTF (4, 5);
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/* Clear out / initialize all complaint counters that have ever been
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incremented. If LESS_VERBOSE is 1, be less verbose about
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successive complaints, since the messages are appearing all
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together during a command that is reporting a contiguous block of
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complaints (rather than being interleaved with other messages). If
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noisy is 1, we are in a noisy command, and our caller will print
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enough context for the user to figure it out. */
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extern void clear_complaints (struct complaints **complaints,
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int less_verbose, int noisy);
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#endif /* !defined (COMPLAINTS_H) */
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