RFR(S) 8055289: Internal Error: mallocTracker.cpp:146 fatal error: Should not use malloc for big memory block, use virtual memory instead

[Coleen Phillimore]

Zhengyu,

This looks really good.
Thanks,
Coleen

On 8/29/14, 2:23 PM, Zhengyu Gu wrote:
> Native Memory Tracking uses bit field for malloc size, it uses 30 bits 
> (1GB-1) on 32-bit system and 62 bits ((1<<62)-1) bytes on 64-bit 
> system, which is not an issue.
>
> Although, JVM does not have such large malloc, but it is possible to 
> request >= 1GB malloc on 32-bit system via Unsafe API.
>
> The solution is to return NULL for such malloc request when NMT is 
> enabled.
>
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8055289
> Webrev: http://cr.openjdk.java.net/~zgu/8055289/webrev.00/ 
> <http://cr.openjdk.java.net/%7Ezgu/8055289/webrev.00/>
>
>
> Thanks,
>
> -Zhengyu