Re: Question about cache flushing and fork

[David S. Miller]

On Mon, 15 Dec 2003 20:40:33 -0800
Randolph Chung <randolph@xxxxxxxxx> wrote:

> Can someone please explain why it is necessary to flush the cache 
> during fork()? (i.e. call to flush_cache_mm() in dup_mmap)

Writable pages that will be shared between the child and
parent are marked read-only and COW, some cpu caches store
protection information in the cache lines in order to avoid
TLB lookups etc. so the caches must be flushed since the
page protection information is changing.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/