RFR: 8264752: SIGFPE crash with option FlightRecorderOptions:threadbuffersize=30M [v2]

[Hui Shi]

On Sat, 17 Apr 2021 04:55:02 GMT, Hui Shi <hshi at openjdk.org> wrote:

>> …ize=30M
>> 
>> Fix misc explicit JFR memory option caused crash and assertion (https://bugs.openjdk.java.net/browse/JDK-8241773).
>> 
>> 1. Fix SIGFPE crash in div_total_by_per_unit.
>>    a) In valid_memory_relations, check threadbuffersize should not larger than memorysize.
>>    b) In "void thread_buffer_size(JfrMemoryOptions* options)", calculate memorysize if it isn't configured, avoid SIGFPE when thread buffer size is larger than default memorysize.
>>    
>> 2. Fix "assert(free_size() == size, "invariant");" in JfrBuffer::initialize.
>>    Limit globalbuffersize and threadbuffersize under 2G, avoid size_t to u4 coversion lost.
>>    
>> 3. Check and report possible inconsistent conditions after jfr memory size adjustment.
>>    a) globalbuffercount < MIN_BUFFER_COUNT
>>    b) globalbuffersize < threadbuffersize
>
> Hui Shi has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix test fail on aarch64 when VM page is larger than 4K

Could someone give a second review before integrate this?

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PR: https://git.openjdk.java.net/jdk/pull/3432