diff options
| author | cinap_lenrek <cinap_lenrek@felloff.net> | 2015-02-07 02:52:23 +0100 |
|---|---|---|
| committer | cinap_lenrek <cinap_lenrek@felloff.net> | 2015-02-07 02:52:23 +0100 |
| commit | b8cf3cb879a19c001796329ebe266104d13e63be (patch) | |
| tree | 745534899e603d5336347c846ad286c3535c43fc /sys/src/9/ppc | |
| parent | f215b660b30cc5e5d318922f545441b4ac14b200 (diff) | |
kernel: reduce Page structure size by changing Page.cachectl[]
there are no kernels currently that do page coloring,
so the only use of cachectl[] is flushing the icache
(on arm and ppc).
on pc64, cachectl consumes 32 bytes in each page resulting
in over 200 megabytes of overhead for 32gb of ram with 4K
pages.
this change removes cachectl[] and adds txtflush ulong
that is set to ~0 by pio() to instruct putmmu() to flush
the icache.
Diffstat (limited to 'sys/src/9/ppc')
| -rw-r--r-- | sys/src/9/ppc/main.c | 2 | ||||
| -rw-r--r-- | sys/src/9/ppc/mmu.c | 15 |
2 files changed, 3 insertions, 14 deletions
diff --git a/sys/src/9/ppc/main.c b/sys/src/9/ppc/main.c index a77f31127..e0badeb57 100644 --- a/sys/src/9/ppc/main.c +++ b/sys/src/9/ppc/main.c @@ -233,7 +233,7 @@ userinit(void) s->flushme++; p->seg[TSEG] = s; pg = newpage(1, 0, UTZERO); - memset(pg->cachectl, PG_TXTFLUSH, sizeof(pg->cachectl)); + pg->txtflush = ~0; segpage(s, pg); k = kmap(s->map[0]->pages[0]); memmove((ulong*)VA(k), initcode, sizeof initcode); diff --git a/sys/src/9/ppc/mmu.c b/sys/src/9/ppc/mmu.c index 94dbeb03c..a47bf2d56 100644 --- a/sys/src/9/ppc/mmu.c +++ b/sys/src/9/ppc/mmu.c @@ -199,7 +199,6 @@ void putmmu(uintptr va, uintptr pa, Page *pg) { int mp; - char *ctl; ulong *p, *ep, *q, pteg; ulong vsid, hash; ulong ptehi, x; @@ -244,21 +243,11 @@ putmmu(uintptr va, uintptr pa, Page *pg) q[0] = ptehi; q[1] = pa; - ctl = &pg->cachectl[m->machno]; - switch(*ctl) { - case PG_NEWCOL: - default: - panic("putmmu: %d\n", *ctl); - break; - case PG_TXTFLUSH: + if(pg->txtflush & (1<<m->machno)){ dcflush((void*)pg->va, BY2PG); icflush((void*)pg->va, BY2PG); - *ctl = PG_NOFLUSH; - break; - case PG_NOFLUSH: - break; + pg->txtflush &= ~(1<<m->machno); } - } void |