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SubjectRe: [ 00/23] [Suspend2] Freezer Upgrade Patches

On Thursday, 26 January 2006 04:45, Nigel Cunningham wrote:
> Hi everyone.
> This set of patches represents the freezer upgrade patches from Suspend2.
> The key features of this changeset are:
> - Use of Christoph Lameter's todo list notifiers, which help with SMP
> cleanness.
> - Splitting the freezing of kernel and userspace processes. Freezing
> currently suffers from a race because userspace processes can be
> submitting work for kernel threads, thereby stopping them from
> responding to freeze messages in a timely manner. The freezer can
> thus give up when it doesn't really need to. (This is not normally
> a problem only because load is not usually high).

Could you please describe specific situation?

> - The use of bdev freezing to ensure filesystems are properly frozen,
> thereby increasing the integrity of on-disk data in the case where
> a resume doesn't occur. This is also helpful in the case of Suspend2,
> where we don't atomically copy all memory, instead writing LRU pages
> separately.

Is this also needed when we do atomically copy all memory?


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