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gdb: maintain ptid -> thread map, optimize find_thread_ptid

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When debugging a large number of threads (thousands), looking up a
thread by ptid_t using the inferior::thread_list linked list can add up.

Add inferior::thread_map, an std::unordered_map indexed by ptid_t, and
change the find_thread_ptid function to look up a thread using
std::unordered_map::find, instead of iterating on all of the
inferior's threads.  This should make it faster to look up a thread
from its ptid.

Change-Id: I3a8da0a839e18dee5bb98b8b7dbeb7f3dfa8ae1c
Co-Authored-By: Pedro Alves <pedro@palves.net>
This commit is contained in:
Simon Marchi
2021-06-11 18:29:33 -04:00
parent 71a2349005
commit 922cc93d5d
6 changed files with 47 additions and 5 deletions
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6
gdb/inferior.h
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@ -63,6 +63,8 @@ struct thread_info;
#include "process-stratum-target.h"
#include "displaced-stepping.h"
#include <unordered_map>
struct infcall_suspend_state;
struct infcall_control_state;
@ -391,6 +393,10 @@ public:
/* This inferior's thread list, sorted by creation order. */
intrusive_list<thread_info> thread_list;
/* A map of ptid_t to thread_info*, for average O(1) ptid_t lookup.
Exited threads do not appear in the map. */
std::unordered_map<ptid_t, thread_info *, hash_ptid> ptid_thread_map;
/* Returns a range adapter covering the inferior's threads,
including exited threads. Used like this: