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Lancelot SIX 40b355f24e gdb/py-inferior: Keep inferior threads in a map
The python code maintains a list of threads for each inferior.  This
list is implemented as a linked list.  When the number of threads grows
high, this implementation can begin to be a performance bottleneck as
finding a particular thread_object in the list has a complexity of O(N).

We see this in ROCgdb[1], a downstream port of GDB for AMDGUP.  On
AMDGPU devices, the number of threads can get significantly higher than
on usual GDB workloads.

In some situations, we can reach the end of the inferior process with
GDB still having a substantial list of known threads.  While running
target_mourn_inferior, we end up in inferior::clear_thread_list which
iterates over all remaining threads and marks each thread exited.  This
fires the gdb::observers::thread_exit observer and eventually
py-inferior.c:set_thread_exited gets called.  This function searches in
the linked list with poor performances.

This patch proposes to change the linked list that keeps the per
inferior_object list of thread_objects into a std::unordered_map.  This
allows to have the search operation complexity be O(1) on average
instead of O(N).

With this patch, we can complete clear_thread_list in about 2.5 seconds
compared to 10 minutes without it.

Except for the performance change, no user visible change is expected.

Regression tested on Ubuntu-22.04 x86_64.

[1] https://github.com/ROCm-Developer-Tools/ROCgdb
2022-11-11 13:50:19 +00:00
bfd PR28834, PR26946 sanity checking section size 2022-11-11 18:05:36 +10:30
binutils Re: Fuzzed files in archives 2022-11-09 17:31:41 +10:30
config configure: require libzstd >= 1.4.0 2022-11-07 14:32:10 +01:00
contrib
cpu Add markers for 2.39 branch 2022-07-08 10:41:07 +01:00
elfcpp gold, dwp: support zstd compressed input debug sections [PR 29641] 2022-11-10 21:42:14 -08:00
etc
gas gas: accept custom ".linefile <n> ." 2022-11-11 09:27:41 +01:00
gdb gdb/py-inferior: Keep inferior threads in a map 2022-11-11 13:50:19 +00:00
gdbserver gdbserver: do not report btrace support if target does not announce it 2022-11-09 17:46:21 +01:00
gdbsupport gdbsupport, gdb: add read_text_file_to_string, use it in linux_common_core_of_thread 2022-11-08 16:50:52 -05:00
gnulib gnulib: update to bd11400942d6 2022-05-02 10:54:19 -04:00
gold Re: gold: add --compress-debug-sections=zstd [PR 29641] 2022-11-11 18:05:36 +10:30
gprof Updated Hungarian translation for the gprof sub-directory. 2022-10-21 10:55:57 +01:00
gprofng gprofng: fix typo in configure.ac 2022-11-10 17:25:07 -08:00
include sim: drop unused CORE_ADDR_TYPE 2022-11-08 14:09:06 +07:00
intl egrep in binutils 2022-09-28 13:37:31 +09:30
ld ld/testsuite: skip ld-size when -shared is not supported 2022-11-10 13:19:15 +01:00
libbacktrace
libctf configure: require libzstd >= 1.4.0 2022-11-07 14:32:10 +01:00
libdecnumber Merge config/ changes from GCC, to enable DFP on AArch64 2022-05-24 10:47:29 +01:00
libiberty Add markers for 2.39 branch 2022-07-08 10:41:07 +01:00
opcodes x86: drop stray IsString from PadLock insns 2022-11-11 09:27:23 +01:00
readline gdb/readline: fix extra 'quit' message problem 2022-05-07 10:49:27 +01:00
sim sim: v850: rename v850.dc to align with other ports 2022-11-11 01:42:29 +07:00
texinfo
zlib Regenerate with automake-1.15.1 2022-07-09 20:10:47 +09:30
.cvsignore
.editorconfig
.gitattributes binutils-gdb/git: highlight whitespace errors in source files 2022-07-25 14:35:41 +01:00
.gitignore
ar-lib
ChangeLog Add ability to create reproducible source tarballs. 2022-10-10 11:28:45 +01:00
compile
config-ml.in
config.guess
config.rpath
config.sub
configure Reapply "Don't build readline/libreadline.a, when --with-system-readline is supplied" 2022-10-20 17:05:04 +02:00
configure.ac Reapply "Don't build readline/libreadline.a, when --with-system-readline is supplied" 2022-10-20 17:05:04 +02:00
COPYING
COPYING.LIB
COPYING.LIBGLOSS
COPYING.NEWLIB
COPYING3
COPYING3.LIB
depcomp
djunpack.bat
install-sh
libtool.m4
ltgcc.m4
ltmain.sh
ltoptions.m4
ltsugar.m4
ltversion.m4
lt~obsolete.m4
MAINTAINERS
Makefile.def
Makefile.in Pass PKG_CONFIG_PATH down from top-level Makefile 2022-04-08 10:56:41 -04:00
Makefile.tpl Pass PKG_CONFIG_PATH down from top-level Makefile 2022-04-08 10:56:41 -04:00
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change
multilib.am
README
README-maintainer-mode Note that at least dejagnu version 1.5.3 is required in order to be ale to run the testsuites. 2022-10-04 10:54:19 +01:00
setup.com
src-release.sh Add ability to create reproducible source tarballs. 2022-10-10 11:28:45 +01:00
symlink-tree
test-driver
ylwrap

		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

Much of the code and documentation enclosed is copyright by
the Free Software Foundation, Inc.  See the file COPYING or
COPYING.LIB in the various directories, for a description of the
GNU General Public License terms under which you can copy the files.

REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info
on where and how to report problems.