- About 80% of PM's process table consisted of per-signal sigaction
structures. This is information not used by the MIB service, and
can safely be stored outside the main process table.
- The MIB service does not need most of the VFS process table, so VFS
now generates a "light" version of its table upon request, with just
the fields used by the MIB service.
The result is a size reduction of the MIB service of about 700KB.
Change-Id: I79fe7239361fbfb45286af8e86a10aed4c2d2be7
Instead of pulling in process tables itself, ProcFS now queries the
MIB service for process information. This reduces ProcFS's memory
usage by about 1MB. The change does have two negative consequences.
First, getting all the original /proc/<pid>/psinfo fields filled in
would take a lot of extra effort. Since the only program that uses
those files at all is mtop(1), we reformat psinfo to expose only the
information used by mtop(1). This means that with this patch, older
copies of MINIX3 ps and top will cease to work.
Second, since both MIB and ProcFS update their own view of the
process list only once per clock tick, ProcFS' view may now be
outdated by up to two clock ticks. This is unlikely to pose a
problem in practice.
Change-Id: Iaa6b60450c8fb52d092962394d33d08bd638bc01
