On Tue, Mar 09, 2021 at 06:57:06PM +0100, Eric Dumazet wrote:
>
>
> On 3/9/21 6:10 PM, Shay Agroskin wrote:
> > The page cache holds pages we allocated in the past during napi cycle,
> > and tracks their availability status using page ref count.
> >
> > The cache can hold up to 2048 pages. Upon allocating a page, we check
> > whether the next entry in the cache contains an unused page, and if so
> > fetch it. If the next page is already used by another entity or if it
> > belongs to a different NUMA core than the napi routine, we allocate a
> > page in the regular way (page from a different NUMA core is replaced by
> > the newly allocated page).
> >
> > This system can help us reduce the contention between different cores
> > when allocating page since every cache is unique to a queue.
>
> For reference, many drivers already use a similar strategy.
Hi Eric
So rather than yet another implementation, should we push for a
generic implementation which any driver can use?
Andrew
