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/kw | |
| 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/kw')
| -rw-r--r-- | sys/src/9/kw/main.c | 2 | ||||
| -rw-r--r-- | sys/src/9/kw/mmu.c | 5 |
2 files changed, 3 insertions, 4 deletions
diff --git a/sys/src/9/kw/main.c b/sys/src/9/kw/main.c index aa722a0eb..8b2080ef7 100644 --- a/sys/src/9/kw/main.c +++ b/sys/src/9/kw/main.c @@ -587,7 +587,7 @@ 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(UINT2PTR(VA(k)), initcode, sizeof initcode); diff --git a/sys/src/9/kw/mmu.c b/sys/src/9/kw/mmu.c index 2557ff59b..5128e2cee 100644 --- a/sys/src/9/kw/mmu.c +++ b/sys/src/9/kw/mmu.c @@ -353,10 +353,9 @@ putmmu(uintptr va, uintptr pa, Page* page) * rather than direct mapped. */ cachedwbinv(); - if(page->cachectl[0] == PG_TXTFLUSH){ - /* pio() sets PG_TXTFLUSH whenever a text pg has been written */ + if(page->txtflush){ cacheiinv(); - page->cachectl[0] = PG_NOFLUSH; + page->txtflush = 0; } //print("putmmu %#p %#p %#p\n", va, pa, PPN(pa)|x); } |