Author: jmolenda
Date: Fri Dec 11 19:32:09 2015
New Revision: 255417
URL: http://llvm.org/viewvc/llvm-project?rev=255417&view=rev
Log:
When supplying memory to expedite the unwinds in the T packet,
include two stack frames worth of unwind information instead of
just one -- the unwinder is trying to fetch two stack frames in
more instances now and we're sending extra memory reads resulting
in a performance degredation while stepping.
Modified:
lldb/trunk/tools/debugserver/source/RNBRemote.cpp
Modified: lldb/trunk/tools/debugserver/source/RNBRemote.cpp
URL:
http://llvm.org/viewvc/llvm-project/lldb/trunk/tools/debugserver/source/RNBRemote.cpp?rev=255417&r1=255416&r2=255417&view=diff
==============================================================================
--- lldb/trunk/tools/debugserver/source/RNBRemote.cpp (original)
+++ lldb/trunk/tools/debugserver/source/RNBRemote.cpp Fri Dec 11 19:32:09 2015
@@ -2812,7 +2812,7 @@ RNBRemote::SendStopReplyPacketForThread
// Add expedited stack memory so stack backtracing doesn't need to
read anything from the
// frame pointer chain.
StackMemoryMap stack_mmap;
- ReadStackMemory (pid, tid, stack_mmap, 1);
+ ReadStackMemory (pid, tid, stack_mmap, 2);
if (!stack_mmap.empty())
{
for (const auto &stack_memory : stack_mmap)
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