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Message-Id: <E1HVEGF-0006d2-00@dorka.pomaz.szeredi.hu> Date: Sat, 24 Mar 2007 22:58:55 +0100 From: Miklos Szeredi <miklos@...redi.hu> To: akpm@...ux-foundation.org CC: dgc@....com, linux-kernel@...r.kernel.org Subject: [patch 3/3] balance dirty pages from loop device From: Miklos Szeredi <mszeredi@...e.cz> The function do_lo_send_aops() should call balance_dirty_pages_ratelimited() after each page similarly to generic_file_buffered_write(). Without this, writing the loop device directly (not through a filesystem) is very slow, and also slows the whole system down, because nr_dirty is constantly over the limit. Beware: this patch without the fix to balance_dirty_pages() makes a loopback mounted filesystem prone to deadlock. Signed-off-by: Miklos Szeredi <mszeredi@...e.cz> --- Index: linux/drivers/block/loop.c =================================================================== --- linux.orig/drivers/block/loop.c 2007-03-24 21:00:40.000000000 +0100 +++ linux/drivers/block/loop.c 2007-03-24 22:07:06.000000000 +0100 @@ -275,6 +275,8 @@ static int do_lo_send_aops(struct loop_d pos += size; unlock_page(page); page_cache_release(page); + balance_dirty_pages_ratelimited(mapping); + cond_resched(); } ret = 0; out: - 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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