linuxpackaging
Which distros support RPMs? Which distros support DEB packages? What other distros and package formats exists? Here is what I think I know, but am interested in getting a more precise answer:
Lots of others probably in the long tail. I know you can use 'alien' to convert RPM to DEB, but it isn't installed by default in new Ubuntu setup so not counting that.
fyi. openSUSE Build Service is excellent, for packages without convoluted dependencies; I've been using it to deliver qtop for multiple distributions, with good success: http://cern.ch/fotis/QTOP/ http://download.opensuse.org/repositories/home:/georgatos/ You can produce all packages via: a tarball-generating Makefile, then kick OBS for the rest.
The issue though gets more complicated if you have dependencies that have varying names across distros or, different packaging schemes (Boost comes to mind, which sometimes is broken up in pieces). If you have such situation, providing a universal solution is more tricky. AFAIK, in the later case you will need to deliver more programming skills, to automate the above.
The slab's reported in slabtop are difficult to quantify to a particular kernel module because they're getting merged down into singular types which overlap based on their similarity to others in terms of the objects they're holding.
Specifically, on modern Linux the names shown in slabinfo are basically a hint because the current slab allocator in the kernel merges multiple slab types together if they are sufficiently similar. If five different subsystems all want to allocate (different) 128-byte objects with no special properties, they don't each get separate slab types with separate slabinfo entries; instead they are all merged into one slab type and thus one slabinfo entry. That slabinfo entry normally shows the name of one of them, probably the first to be set up, with no direct hint that it also includes the usage of all the others.
(The others don't appear in slabinfo at all.)
This article goes on to discuss that because of the above merging, often times there's slab cache types that don't show up at all in /proc/slabinfo. You can see some of this effect by looking here: /sys/kernel/slab. This directory shows which slab caches are getting merged with others in the form of symbolic links.
The image on the left shows the links (light blue) from the directory /sys/kernel/slab which are getting merged into other slabs. The image on the right shows all the caches which are merging into :t-0000256 slab.
If we continue to look through the /sys/kernel/slab directory:
$ ls -l /sys/kernel/slab/ | grep filp
lrwxrwxrwx 1 root root 0 Aug 5 21:23 filp -> :t-0000256
Here's the filp you were inquiring about. To see more about it you might want to try installing the slabinfo CLI.
I did not have this CLI available to triage this further on CentOS 7.x but you may want to investigate it. Compiling this CLI gives you access to slabinfo -a which shows the aliases that the slabs associate with under /sys/kernel/slab. I believe it's these alias that you're looking for which will help to associate which slabs are which in the slabtop.
Best Answer
There's a list of Linux Package Formats on wikipedia here and a list of common package management systems here.