From: Richard Miller <9fans@hamnavoe.com>
To: 9fans@9fans.net
Subject: Re: [9fans] mmu fix?
Date: Thu, 12 Nov 2009 21:19:16 +0000 [thread overview]
Message-ID: <8a361ea78b8d25f710617b31c2eaf1ec@hamnavoe.com> (raw)
In-Reply-To: <97f3a3e3c85b3c279d6121be7778ef43@coraid.com>
The two cases are:
/sys/src/9/pc/mmu.c:510,513
if(didmmuinit)
map = xspanalloc(BY2PG, BY2PG, 0);
else
map = rampage();
xspanalloc returns zeroed memory. rampage is only called early
in startup, and returns virgin memory which in the olden days
would have been zeroed at boot time. But nowadays:
/sys/src/9/pc/memory.c:443
/* memset(va, 0, MB); so damn slow to memset all of memory */
So I think you want to clear the page only for the rampage case.
next prev parent reply other threads:[~2009-11-12 21:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-12 20:57 erik quanstrom
2009-11-12 21:19 ` Richard Miller [this message]
[not found] <<8a361ea78b8d25f710617b31c2eaf1ec@hamnavoe.com>
2009-11-12 21:34 ` erik quanstrom
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