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