From: Simon Marchi <simark@simark.ca>
To: Tom Tromey <tom@tromey.com>, gdb-patches@sourceware.org
Subject: Re: [RFA 26/42] Remove free_pendings
Date: Tue, 10 Jul 2018 02:55:00 -0000 [thread overview]
Message-ID: <2161ee9f-d85a-a962-311a-333b6e7c05ee@simark.ca> (raw)
In-Reply-To: <20180523045851.11660-27-tom@tromey.com>
On 2018-05-23 12:58 AM, Tom Tromey wrote:
> buildsym.c currently keeps a free list of "struct pending"s. However,
> this didn't seem necessary to me, and so this patch removes the free
> list.
LGTM.
It looks like this was to avoid some allocations/deallocations, for performance?
Since it's hard to tell if something is worth it performance-wise without data,
I made some quick measurements. I compiled GDB with optimizations, then loaded
my debug build of GDB in it like this:
$ for i in 1 2 3; do /usr/bin/time -a -o after ./gdb /home/simark/build/binutils-gdb/gdb/gdb -readnow -batch; done
This is before:
58.66user 5.38system 1:04.47elapsed 99%CPU (0avgtext+0avgdata 2841916maxresident)k
2520inputs+0outputs (1major+679737minor)pagefaults 0swaps
59.24user 5.52system 1:05.07elapsed 99%CPU (0avgtext+0avgdata 2841572maxresident)k
1616inputs+0outputs (4major+679723minor)pagefaults 0swaps
61.50user 5.38system 1:07.36elapsed 99%CPU (0avgtext+0avgdata 2841764maxresident)k
0inputs+0outputs (0major+679732minor)pagefaults 0swaps
This is after:
53.14user 4.91system 0:59.02elapsed 98%CPU (0avgtext+0avgdata 2841824maxresident)k
0inputs+0outputs (0major+679713minor)pagefaults 0swaps
52.70user 4.97system 0:58.49elapsed 98%CPU (0avgtext+0avgdata 2842052maxresident)k
0inputs+0outputs (0major+679747minor)pagefaults 0swaps
54.42user 5.30system 1:01.11elapsed 97%CPU (0avgtext+0avgdata 2841764maxresident)k
0inputs+0outputs (0major+679760minor)pagefaults 0swaps
So, unless I mixed up "before" and "after", it looks like this patch actually
improves the performance of GDB!
Simon
next prev parent reply other threads:[~2018-07-10 2:55 UTC|newest]
Thread overview: 129+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-23 4:59 [RFA 00/42] Remove globals from buildsym Tom Tromey
2018-05-23 4:59 ` [RFA 07/42] Move last_source_start_addr to buildsym_compunit Tom Tromey
2018-07-08 16:10 ` Simon Marchi
2018-05-23 4:59 ` [RFA 04/42] Move last_source file " Tom Tromey
2018-07-07 3:51 ` Simon Marchi
2018-07-08 16:33 ` Tom Tromey
2018-07-08 16:37 ` Simon Marchi
2018-07-08 16:52 ` Tom Tromey
2018-07-08 17:01 ` Simon Marchi
2018-05-23 4:59 ` [RFA 10/42] Move some code from buildsym to stabsread Tom Tromey
2018-07-05 19:16 ` Keith Seitz
2018-07-08 16:35 ` Simon Marchi
2018-07-08 16:59 ` Tom Tromey
2018-07-08 16:37 ` Tom Tromey
2018-05-23 4:59 ` [RFA 26/42] Remove free_pendings Tom Tromey
2018-07-10 2:55 ` Simon Marchi [this message]
2018-07-10 3:16 ` Simon Marchi
2018-05-23 4:59 ` [RFA 23/42] Move pending addrmap globals to buildsym_compunit Tom Tromey
2018-07-10 1:56 ` Simon Marchi
2018-07-12 4:35 ` Tom Tromey
2018-05-23 4:59 ` [RFA 09/42] Make context_stack_size static in buildsym.c Tom Tromey
2018-07-08 16:16 ` Simon Marchi
2018-05-23 4:59 ` [RFA 14/42] Move scan_file_globals declaration to stabsread.h Tom Tromey
2018-07-08 16:52 ` Simon Marchi
2018-07-09 23:07 ` Tom Tromey
2018-05-23 4:59 ` [RFA 12/42] Move within_function to stabsread Tom Tromey
2018-07-08 16:49 ` Simon Marchi
2018-05-23 4:59 ` [RFA 28/42] Set list_in_scope later in DWARF reader Tom Tromey
2018-07-06 18:11 ` Keith Seitz
2018-07-10 3:23 ` Simon Marchi
2018-07-15 17:55 ` Tom Tromey
2018-05-23 4:59 ` [RFA 01/42] Use new and delete for buildsym_compunit Tom Tromey
2018-07-05 18:50 ` Keith Seitz
2018-07-07 2:31 ` Simon Marchi
2018-07-08 16:25 ` Tom Tromey
2018-05-23 4:59 ` [RFA 29/42] Move the symbol lists to buildsym_compunit Tom Tromey
2018-07-06 18:35 ` Keith Seitz
2018-07-12 4:45 ` Tom Tromey
2018-07-10 3:38 ` Simon Marchi
2018-07-15 17:44 ` Tom Tromey
2018-05-23 4:59 ` [RFA 03/42] Add assert in prepare_for_building Tom Tromey
2018-07-07 14:06 ` Simon Marchi
2018-05-23 4:59 ` [RFA 20/42] Use outermost_context_p in more places Tom Tromey
2018-07-08 17:13 ` Simon Marchi
2018-05-23 4:59 ` [RFA 15/42] Remove merge_symbol_lists Tom Tromey
2018-07-08 16:54 ` Simon Marchi
2018-05-23 4:59 ` [RFA 17/42] Move the subfile stack to buildsym_compunit Tom Tromey
2018-07-08 16:59 ` Simon Marchi
2018-05-23 4:59 ` [RFA 13/42] Remove buildsym_new_init Tom Tromey
2018-07-08 16:51 ` Simon Marchi
2018-05-23 4:59 ` [RFA 18/42] Make free_pending_blocks static Tom Tromey
2018-07-08 17:04 ` Simon Marchi
2018-05-23 4:59 ` [RFA 21/42] Move the context stack to buildsym_compunit Tom Tromey
2018-07-06 17:30 ` Keith Seitz
2018-07-15 18:09 ` Tom Tromey
[not found] ` <93a9597f-e7ff-e8ff-e873-9cee5b84d7cc@simark.ca>
2018-07-10 1:45 ` Simon Marchi
2018-07-15 18:10 ` Tom Tromey
2018-05-23 4:59 ` [RFA 16/42] Use gdb_assert in two places in buildsym.c Tom Tromey
2018-07-08 16:55 ` Simon Marchi
2018-07-09 23:13 ` Tom Tromey
2018-05-23 4:59 ` [RFA 25/42] Remove the "listhead" argument from finish_block Tom Tromey
2018-07-10 2:07 ` Simon Marchi
2018-05-23 4:59 ` [RFA 05/42] Move pending_macros to buildsym_compunit Tom Tromey
2018-07-07 15:41 ` Simon Marchi
2018-07-08 16:35 ` Tom Tromey
2018-05-23 4:59 ` [RFA 02/42] Change buildsym_compunit::comp_dir to be a unique_xmalloc_ptr Tom Tromey
2018-07-07 2:34 ` Simon Marchi
2018-05-23 4:59 ` [RFA 22/42] Move current_subfile to buildsym_compunit Tom Tromey
2018-07-10 1:52 ` Simon Marchi
2018-07-12 4:34 ` Tom Tromey
2018-05-23 4:59 ` [RFA 27/42] Do not look at file symbols when reading psymtabs Tom Tromey
2018-07-10 3:19 ` Simon Marchi
2018-05-23 4:59 ` [RFA 08/42] Move processing_acc_compilation to dbxread.c Tom Tromey
2018-07-08 16:15 ` Simon Marchi
2018-05-23 4:59 ` [RFA 06/42] Move have_line_numbers to buildsym_compunit Tom Tromey
2018-07-05 19:01 ` Keith Seitz
2018-07-08 16:05 ` Simon Marchi
2018-07-08 16:26 ` Tom Tromey
2018-05-23 4:59 ` [RFA 19/42] Move the using directives " Tom Tromey
2018-07-05 20:14 ` Keith Seitz
2018-07-08 16:28 ` Tom Tromey
2018-07-08 17:08 ` Simon Marchi
2018-05-23 6:16 ` [RFA 39/42] Parameterize cp_scan_for_anonymous_namespaces Tom Tromey
2018-07-06 19:23 ` Keith Seitz
2018-07-08 16:40 ` Tom Tromey
2018-07-10 4:25 ` Simon Marchi
2018-05-23 6:16 ` [RFA 32/42] Remove EXTERN from buildsym.h Tom Tromey
2018-07-10 3:44 ` Simon Marchi
2018-05-23 6:16 ` [RFA 41/42] Remove some unused buildsym functions Tom Tromey
2018-07-10 4:37 ` Simon Marchi
2018-05-23 6:16 ` [RFA 42/42] Remove record_line_ftype Tom Tromey
2018-07-10 4:38 ` Simon Marchi
2018-05-23 6:16 ` [RFA 11/42] Move processing_gcc to stabsread Tom Tromey
2018-07-08 16:46 ` Simon Marchi
2018-07-08 16:56 ` Tom Tromey
2018-05-23 6:16 ` [RFA 33/42] Remove parameter from record_pending_block Tom Tromey
2018-07-10 3:49 ` Simon Marchi
2018-05-23 6:16 ` [RFA 37/42] Move struct buildsym_compunit to buildsym.h Tom Tromey
2018-07-10 4:15 ` Simon Marchi
2018-05-23 6:16 ` [RFA 40/42] Convert the DWARF reader to new-style buildysm Tom Tromey
2018-07-06 20:10 ` Keith Seitz
2018-07-10 4:36 ` Simon Marchi
2018-07-15 17:38 ` Tom Tromey
2018-05-23 6:16 ` [RFA 34/42] Add many methods to buildsym_compunit Tom Tromey
2018-07-06 19:16 ` Keith Seitz
2018-07-08 16:39 ` Tom Tromey
2018-07-10 4:08 ` Simon Marchi
2018-07-12 5:18 ` Tom Tromey
2018-07-10 4:08 ` Simon Marchi
2018-07-10 4:12 ` Simon Marchi
2018-05-23 6:16 ` [RFA 35/42] Do not use buildsym.h in some files Tom Tromey
2018-07-10 4:10 ` Simon Marchi
2018-05-23 6:16 ` [RFA 36/42] Remove reset_symtab_globals Tom Tromey
2018-07-10 4:11 ` Simon Marchi
2018-05-23 6:16 ` [RFA 24/42] Move pending_blocks and pending_block_obstack to buildsym_compunit Tom Tromey
2018-07-10 2:05 ` Simon Marchi
2018-07-12 4:39 ` Tom Tromey
2018-07-12 5:03 ` Tom Tromey
2018-05-23 6:16 ` [RFA 31/42] Remove a TODO Tom Tromey
2018-07-10 3:42 ` Simon Marchi
2018-05-23 7:31 ` [RFA 38/42] Introduce legacy-buildsym.h Tom Tromey
2018-07-10 4:22 ` Simon Marchi
2018-07-15 18:43 ` Tom Tromey
2018-07-15 19:46 ` Simon Marchi
2018-07-16 0:22 ` Tom Tromey
2018-05-23 8:49 ` [RFA 30/42] Remove buildsym_init Tom Tromey
2018-07-10 3:41 ` Simon Marchi
2018-06-18 14:46 ` [RFA 00/42] Remove globals from buildsym Tom Tromey
2018-07-05 18:21 ` Keith Seitz
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