Re: Problems with VM_MIXEDMAP removal from /proc/<pid>/smaps

Jan Kara [off-list ref] writes:

Hi Jeff,

On Tue 09-10-18 15:43:41, Jeff Moyer wrote:

quoted

I'm intrigued by the use case.  Do I understand you correctly that the
database in question does not intend to make data persistent from
userspace?  In other words, fsync/msync system calls are being issued by
the database?

Yes, at least at the initial stage, they use fsync / msync to persist data.

OK.

quoted

I guess what I'm really after is a statement of requirements or
expectations.  It would be great if you could convince the database
developer to engage in this discussion directly.

So I talked to them and what they really look after is the control over the
amount of memory needed by the kernel. And they are right that if your
storage needs page cache, the amount of memory you need to set aside for the
kernel is larger.

OK, thanks a lot for following up, Jan!

-Jeff