On Mon, Jul 23, 2012 at 02:38:13PM +0100, Mel Gorman wrote: > Changelog since V1 > o Expand some of the notes (jrnieder) > o Correct upstream commit SHA1 (hugh) > > This series is related to the new addition to stable_kernel_rules.txt > > - Serious issues as reported by a user of a distribution kernel may also > be considered if they fix a notable performance or interactivity issue. > As these fixes are not as obvious and have a higher risk of a subtle > regression they should only be submitted by a distribution kernel > maintainer and include an addendum linking to a bugzilla entry if it > exists and additional information on the user-visible impact. > > All of these patches have been backported to a distribution kernel and > address some sort of performance issue in the VM. As they are not all > obvious, I've added a "Stable note" to the top of each patch giving > additional information on why the patch was backported. Lets see where > the boundaries lie on how this new rule is interpreted in practice :). > > Patch 1 Performance fix for tmpfs > Patch 2 Memory hotadd fix > Patch 3 Reduce boot time on large machines > Patches 4-5 Reduce stalls for wait_iff_congested > Patches 6-8 Reduce excessive reclaim of slab objects which for some workloads > will reduce the amount of IO required > Patches 9-10 limits the amount of page reclaim when THP/Compaction is active. > Excessive reclaim in low memory situations can lead to stalls some > of which are user visible. > Patches 11-19 reduce the amount of churn of the LRU lists. Poor reclaim > decisions can impair workloads in different ways and there have > been complaints recently the reclaim decisions of modern kernels > are worse than older ones. > Patches 20-21 reduce the amount of CPU kswapd uses in some cases. This > is harder to trigger but were developed due to bug reports about > 100% CPU usage from kswapd. > Patches 22-25 are mostly related to interactivity when THP is enabled. > Patches 26-30 are also related to page reclaim decisions, particularly > the residency of mapped pages. > Patches 31-34 fix a major page allocator performance regression > > All of the patches will apply to 3.0-stable but the ordering of the > patches is such that applying them to 3.2-stable and 3.4-stable should > be straight-forward. I can't find any of these that should have gone to 3.4-stable, given that they all were included in 3.4 already, right? I've queued up the whole lot for the 3.0-stable tree, thanks so much for providing them. greg k-h -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>