Re: [dpdk-dev] [PATCH v2 2/2] memalloc: do not use lockfiles for single file segments mode

[Thomas Monjalon <thomas@monjalon.net>]

29/03/2019 18:55, Anatoly Burakov:
> Due to internal glibc limitations [1], DPDK may exhaust internal
> file descriptor limits when using smaller page sizes, which results
> in inability to use system calls such as select() by user
> applications.
> 
> Single file segments option stores lock files per page to ensure
> that pages are deleted when there are no more users, however this
> is not necessary because the processes will be holding onto the
> pages anyway because of mmap(). Thus, removing pages from the
> filesystem is safe even though they may be used by some other
> secondary process. As a result, single file segments mode no
> longer stores inordinate amounts of segment fd's, and the above
> issue with fd limits is solved.
> 
> However, this will not work for legacy mem mode. For that, simply
> document that using bigger page sizes is the only option.
> 
> [1] https://mails.dpdk.org/archives/dev/2019-February/124386.html
> 
> Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>

Applied, thanks