ACK/Cmnt: [PATCH][B][aws] UBUNTU SAUCE: mm: swap: improve swap readahead heuristic

[Connor Kuehl]

On 12/3/19 2:58 AM, Andrea Righi wrote:
> BugLink: https://bugs.launchpad.net/bugs/1831940
> 
> Apply a more aggressive swapin readahead policy to improve swapoff
> performance.
> 
> The idea is to start with no readahead (only read one page) and linearly
> increment the amount of readahead pages each time swapin_readahead() is
> called, up to the maximum cluster size (defined by vm.page-cluster),
> then go back to one page to give the disk enough time to prefetch the
> requested pages and avoid re-requesting them multiple times.
> 
> Also increase the default vm.page-cluster size to 8 (that seems to work
> better with this new heuristic).
> 
> Signed-off-by: Andrea Righi <andrea.righi at canonical.com>

Was this patch was included in the AMI that received positive test 
results? I remember having a small chat about a recent round of testing 
for this on IRC but also wanted the mailing list to be informed of the 
positive results too :-)

Acked-by: Connor Kuehl <connor.kuehl at canonical.com>