RFR 8035735: Metaspace::contains become extremely slow in some cases (original) (raw)

Coleen Phillimore coleen.phillimore at oracle.com
Fri Feb 28 13:57:35 PST 2014

On 2/28/2014 4:48 PM, Jon Masamitsu wrote:

Coleen,

You're casting something to a Method*, right? Is that assert ever going to fail?

It's not going to fail the assert, but it might crash trying to access the Metadata vtable if it's not metadata. I debated this with myself - would we rather have a SEGV there or no assert at all and some problem later on? We don't have a faster way to check whether somethings in the metaspace that is safe from CMS deleting mmap regions while we look at them.

Coleen

Jon On 2/28/2014 12:08 PM, Coleen Phillimore wrote: Summary: Call ismetadata instead which does less work for the call in debugInfo.hpp which is called for all compiled code stack frames.

open webrev at http://cr.openjdk.java.net/~coleenp/8035735/ bug link https://bugs.openjdk.java.net/browse/JDK-8035735 Tested with failing test case, nsk.quick.testlist, jcks and jtreg tests. Coleen

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