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win: Cap number of locks gathered

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On Win 7 in a debug configuration, this was gathering hundreds of
thousands of locks, causing test timeouts to be exceeded. On user
machines, UnhandledExceptionHandler() probably would have timed out
also. Arbitrarily cap the number of locks captured, as we don't have a
pressing need for anything other than the LoaderLock anyway.

In the future, we may want to figure out a signalling mechanism so that
the client can note other interesting locks to be grabbed, and just
avoid walking the list entirely.

R=mark@chromium.org
BUG=chromium:546288

Review URL: https://codereview.chromium.org/1475033005 .
This commit is contained in:
Scott Graham 2015-11-26 12:19:26 -08:00
parent 33414779e1
commit b3464d96f5
1 changed files with 15 additions and 0 deletions
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15
snapshot/win/process_snapshot_win.cc
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@ -448,6 +448,10 @@ void ProcessSnapshotWin::ReadLocks(
WinVMAddress current_address = start_address_backward;
WinVMAddress last_good_address;
// Cap the list of locks we capture arbitrarily so we don't walk forever.
const int kMaxWalkLength = 100;
int walk_count = 0;
// Typically, this seems to be a circular list, but it's not clear that it
// always is, so follow Blink fields back to the head (or where we started)
// before following Flink to capture memory.
@ -473,6 +477,9 @@ void ProcessSnapshotWin::ReadLocks(
critical_section_debug.ProcessLocksList.Blink -
offsetof(process_types::RTL_CRITICAL_SECTION_DEBUG<Traits>,
ProcessLocksList);
walk_count++;
if (walk_count == kMaxWalkLength)
break;
} while (current_address != start_address_backward &&
current_address != kInvalid);
@ -481,6 +488,8 @@ void ProcessSnapshotWin::ReadLocks(
current_address = last_good_address;
}
walk_count = 0;
const WinVMAddress start_address_forward = current_address;
// current_address is now the head of the list, walk Flink to add the whole
@ -513,6 +522,12 @@ void ProcessSnapshotWin::ReadLocks(
critical_section_debug.ProcessLocksList.Flink -
offsetof(process_types::RTL_CRITICAL_SECTION_DEBUG<Traits>,
ProcessLocksList);
walk_count++;
// Walk twice as far on the forward walk, so that if we started at an
// important one (for example the Loader Lock), we get it, and ones that
// were presumably allocated temporally near it.
if (walk_count == kMaxWalkLength * 2)
break;
} while (current_address != start_address_forward &&
current_address != kInvalid);
}