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Date: Thu, 14 Mar 2013 18:08:14 +0800 From: Wanpeng Li <liwanp@...ux.vnet.ibm.com> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Andrew Morton <akpm@...ux-foundation.org> Cc: Dan Magenheimer <dan.magenheimer@...cle.com>, Seth Jennings <sjenning@...ux.vnet.ibm.com>, Konrad Rzeszutek Wilk <konrad@...nok.org>, Minchan Kim <minchan@...nel.org>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Wanpeng Li <liwanp@...ux.vnet.ibm.com> Subject: [PATCH v2 1/4] introduce zero filled pages handler Introduce zero-filled pages handler to capture and handle zero pages. Acked-by: Dan Magenheimer <dan.magenheimer@...cle.com> Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com> --- drivers/staging/zcache/zcache-main.c | 26 ++++++++++++++++++++++++++ 1 files changed, 26 insertions(+), 0 deletions(-) diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c index 328898e..b71e033 100644 --- a/drivers/staging/zcache/zcache-main.c +++ b/drivers/staging/zcache/zcache-main.c @@ -460,6 +460,32 @@ static void zcache_obj_free(struct tmem_obj *obj, struct tmem_pool *pool) kmem_cache_free(zcache_obj_cache, obj); } +static bool page_zero_filled(void *ptr) +{ + unsigned int pos; + unsigned long *page; + + page = (unsigned long *)ptr; + + for (pos = 0; pos < PAGE_SIZE / sizeof(*page); pos++) { + if (page[pos]) + return false; + } + + return true; +} + +static void handle_zero_page(void *page) +{ + void *user_mem; + + user_mem = kmap_atomic(page); + memset(user_mem, 0, PAGE_SIZE); + kunmap_atomic(user_mem); + + flush_dcache_page(page); +} + static struct tmem_hostops zcache_hostops = { .obj_alloc = zcache_obj_alloc, .obj_free = zcache_obj_free, -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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