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SubjectRe: [PATCH 3/4] mm: Gather more PFNs before sending a TLB to flush unmapped pages
On 04/16/2015 06:22 AM, Mel Gorman wrote:
> The patch "mm: Send a single IPI to TLB flush multiple pages when unmapping"
> would batch 32 pages before sending an IPI. This patch increases the size of
> the data structure to hold a pages worth of PFNs before sending an IPI. This
> is a trade-off between memory usage and reducing IPIS sent. In the ideal
> case where multiple processes are reading large mapped files, this patch
> reduces interrupts/second from roughly 180K per second to 60K per second.
> Signed-off-by: Mel Gorman <>

Reviewed-by: Rik van Riel <>

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