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Fix minidump size limit used for MinidumpSizeLimit unittest

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If the stack sizes for threads in the MinidumpSizeLimit test are too big,
then subtracting 64KB from the normal minidump file size is not enough to
trigger the size-limiting logic.  Instead of basing the arbitrary limit off
of the normal file size, make it relative to the 8KB stack size the logic
assumes.

BUG=google-breakpad:510
TEST=Ran unittests
Review URL: https://breakpad.appspot.com/504002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1090 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
mkrebs@chromium.org 2012-12-12 02:30:09 +00:00
parent d4df92aedc
commit b7aeb98608
1 changed files with 25 additions and 4 deletions
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29
src/client/linux/minidump_writer/minidump_writer_unittest.cc
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@ -689,9 +689,22 @@ TEST(MinidumpWriterTest, MinidumpSizeLimit) {
// Third, write a minidump with a size limit small enough to be triggered.
{
// Set size limit to the normal file size minus some arbitrary amount --
// enough to make the limiting code kick in.
const off_t minidump_size_limit = normal_file_size - 64*1024;
// Set size limit to some arbitrary amount, such that the limiting code
// will kick in. The equation used to set this value was determined by
// simply reversing the size-limit logic a little bit in order to pick a
// size we know will trigger it. The definition of
// kLimitAverageThreadStackLength here was copied from class
// MinidumpWriter in minidump_writer.cc.
static const unsigned kLimitAverageThreadStackLength = 8 * 1024;
off_t minidump_size_limit = kNumberOfThreadsInHelperProgram *
kLimitAverageThreadStackLength;
// If, in reality, each of the threads' stack is *smaller* than
// kLimitAverageThreadStackLength, the normal file size could very well be
// smaller than the arbitrary limit that was just set. In that case,
// either of these numbers should trigger the size-limiting code, but we
// might as well pick the smallest.
if (normal_file_size < minidump_size_limit)
minidump_size_limit = normal_file_size;
string limit_dump = temp_dir.path() +
"/minidump-writer-unittest-limit.dmp";
@ -701,7 +714,9 @@ TEST(MinidumpWriterTest, MinidumpSizeLimit) {
struct stat st;
ASSERT_EQ(0, stat(limit_dump.c_str(), &st));
ASSERT_GT(st.st_size, 0);
// Make sure the file size is at least smaller than the original.
// Make sure the file size is at least smaller than the original. If this
// fails because it's the same size, then the size-limit logic didn't kick
// in like it was supposed to.
EXPECT_LT(st.st_size, normal_file_size);
Minidump minidump(limit_dump.c_str());
@ -721,6 +736,12 @@ TEST(MinidumpWriterTest, MinidumpSizeLimit) {
// Make sure stack size shrunk by at least 1KB per extra thread. The
// definition of kLimitBaseThreadCount here was copied from class
// MinidumpWriter in minidump_writer.cc.
// Note: The 1KB is arbitrary, and assumes that the thread stacks are big
// enough to shrink by that much. For example, if each thread stack was
// originally only 2KB, the current size-limit logic wouldn't actually
// shrink them because that's the size to which it tries to shrink. If
// you fail this part of the test due to something like that, the test
// logic should probably be improved to account for your situation.
const unsigned kLimitBaseThreadCount = 20;
const unsigned kMinPerExtraThreadStackReduction = 1024;
const int min_expected_reduction = (kNumberOfThreadsInHelperProgram -