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extent scan: only write a detailed debug log when there's an exception
Note that when enabled, the logs are still very CPU-intensive, but most of the logs will be discarded. Signed-off-by: Zygo Blaxell <bees@furryterror.org>
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@ -933,6 +933,7 @@ BeesScanModeExtent::SizeTier::find_next_extent()
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// Low-level extent search debugging
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shared_ptr<ostringstream> debug_oss;
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const bool debug_oss_only_exceptions = true;
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#if 0
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// Enable a _lot_ of debugging output
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debug_oss = make_shared<ostringstream>();
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@ -966,7 +967,9 @@ BeesScanModeExtent::SizeTier::find_next_extent()
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);
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}
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if (debug_oss) {
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BEESLOGDEBUG("debug oss trace:\n" << debug_oss->str());
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if (!debug_oss_only_exceptions || exception_check()) {
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BEESLOGDEBUG("debug oss trace:\n" << debug_oss->str());
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}
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}
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}
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BtrfsIoctlSearchKey::s_debug_ostream.reset();
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@ -1002,7 +1005,9 @@ BeesScanModeExtent::SizeTier::find_next_extent()
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// There is a lot of debug output. Dump it if it gets too long
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if (!debug_oss->str().empty()) {
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if (crawl_time.age() > 1) {
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BEESLOGDEBUG("debug oss trace (so far):\n" << debug_oss->str());
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if (!debug_oss_only_exceptions) {
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BEESLOGDEBUG("debug oss trace (so far):\n" << debug_oss->str());
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}
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debug_oss->str("");
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}
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}
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