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cd85379104
Replace MAXPHYS by runtime variable maxphys. It is initialized from MAXPHYS by default, but can be also adjusted with the tunable kern.maxphys. Make b_pages[] array in struct buf flexible. Size b_pages[] for buffer cache buffers exactly to atop(maxbcachebuf) (currently it is sized to atop(MAXPHYS)), and b_pages[] for pbufs is sized to atop(maxphys) + 1. The +1 for pbufs allow several pbuf consumers, among them vmapbuf(), to use unaligned buffers still sized to maxphys, esp. when such buffers come from userspace (*). Overall, we save significant amount of otherwise wasted memory in b_pages[] for buffer cache buffers, while bumping MAXPHYS to desired high value. Eliminate all direct uses of the MAXPHYS constant in kernel and driver sources, except a place which initialize maxphys. Some random (and arguably weird) uses of MAXPHYS, e.g. in linuxolator, are converted straight. Some drivers, which use MAXPHYS to size embeded structures, get private MAXPHYS-like constant; their convertion is out of scope for this work. Changes to cam/, dev/ahci, dev/ata, dev/mpr, dev/mpt, dev/mvs, dev/siis, where either submitted by, or based on changes by mav. Suggested by: mav (*) Reviewed by: imp, mav, imp, mckusick, scottl (intermediate versions) Tested by: pho Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D27225 |
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| bde | ||
| cache | ||
| concat | ||
| eli | ||
| gate | ||
| journal | ||
| label | ||
| linux_lvm | ||
| mirror | ||
| mountver | ||
| multipath | ||
| nop | ||
| part | ||
| raid | ||
| raid3 | ||
| shsec | ||
| stripe | ||
| uzip | ||
| vinum | ||
| virstor | ||
| zero | ||
| geom.h | ||
| geom_bsd_enc.c | ||
| geom_ccd.c | ||
| geom_ctl.c | ||
| geom_ctl.h | ||
| geom_dbg.h | ||
| geom_dev.c | ||
| geom_disk.c | ||
| geom_disk.h | ||
| geom_dump.c | ||
| geom_event.c | ||
| geom_flashmap.c | ||
| geom_flashmap.h | ||
| geom_int.h | ||
| geom_io.c | ||
| geom_kern.c | ||
| geom_map.c | ||
| geom_redboot.c | ||
| geom_slice.c | ||
| geom_slice.h | ||
| geom_subr.c | ||
| geom_vfs.c | ||
| geom_vfs.h | ||
| notes | ||