Messages in this thread | | | Date | Thu, 15 Mar 2001 21:56:07 -0300 (BRT) | From | Marcelo Tosatti <> | Subject | Reserved memory for highmem bouncing (fwd) |
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Ingo,
Any comments?
---------- Forwarded message ---------- Date: Wed, 28 Feb 2001 02:02:16 -0300 (BRT) From: Marcelo Tosatti <marcelo@conectiva.com.br> To: Ingo Molnar <mingo@elte.hu> Cc: lkml <linux-kernel@vger.kernel.org> Subject: Reserved memory for highmem bouncing
Hi Ingo,
I have a question about the highmem page IO deadlock fix which is in 2.4.2-ac. (the emergency memory thing)
The old create_bounce code used to set PF_MEMALLOC on the task flags and call wakeup_bdflush(1) in case GFP_BUFFER page allocation failed. That was broken because flush_dirty_buffers() could try to flush a buffer pointing to highmem page, which would end up in create_bounce again, but with PF_MEMALLOC.
Have you tried to make flush_dirty_buffers() only flush buffers pointing to lowmem pages in case the caller wants it to do so?
This way you can call flush_dirty_buffers() with the guarantee you're going to free useful (lowmem) memory. This also throttles high mem writes giving priority to low mem ones.
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