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SubjectRe: Linux-2.4.5
On Sat, 26 May 2001, Linus Torvalds wrote:

> if (gfp_mask & __GFP_WAIT) {
> memory_pressure++;
> - try_to_free_pages(gfp_mask);
> - goto try_again;
> + if (!order || free_shortage()) {
> + int progress = try_to_free_pages(gfp_mask);
> + if (progress || gfp_mask & __GFP_IO)
> + goto try_again;
> + }
> }

Yes, this is it.

> Testing is good. But I want to understand how we get into the
> situation in the first place, and whether there are ways to alleviate
> those problems too.

As I said create_buffers() -> get_unused_buffer_head()
-> __alloc_pages() -> loop infinitely.

Your simplification of get_unused_buffer_head() fits in
nicely with this.

regards,

Rik
--
Virtual memory is like a game you can't win;
However, without VM there's truly nothing to lose...

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