Hi, Thomas 

>-----Original Message-----
>From: Thomas Munro [mailto:thomas.mu...@gmail.com]
>Subject: Re: Copy data to DSA area
>
>On Wed, May 8, 2019 at 5:29 PM Ideriha, Takeshi 
><ideriha.take...@jp.fujitsu.com>
>wrote:
>> >From: Ideriha, Takeshi [mailto:ideriha.take...@jp.fujitsu.com]
>> >Sent: Friday, April 26, 2019 11:50 PM Well, after developing PoC, I
>> >realized that this PoC doesn't solve the local process is crashed
>> >before the context becomes shared because local process keeps track
>> >of pointer to chunks.
>> >Maybe all of you have already noticed and pointed out this case :) So
>> >it needs another work but this poc is a good step for me to advance more.
>>
>> I think the point to prevent memory leak is allocating memory and
>> storing its address into a structure at the same time. This structure
>> should be trackable from other process.
>
>I'm not sure that it's necessarily wrong to keep tracking information in 
>private memory.
>If any backend crashes, the postmaster will terminate all backends and 
>reinitialise
>everything anyway, because shared memory might be corrupted.
Thank you very much for the clarification. I haven't looked into reinitialize 
sequence
so much. I checked CreateSharedMemoryAndSemaphores is called again and shared
memory gets initialized. So I'm going to put keep tracking information in 
private 
memory and send a patch.

Regards,
Takeshi Ideriha

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