On Mon, Sep 2, 2024 at 5:09 AM Yunsheng Lin <linyunsheng@xxxxxxxxxx> wrote: > > We are about to use page_frag_alloc_*() API to not just > allocate memory for skb->data, but also use them to do > the memory allocation for skb frag too. Currently the > implementation of page_frag in mm subsystem is running > the offset as a countdown rather than count-up value, > there may have several advantages to that as mentioned > in [1], but it may have some disadvantages, for example, > it may disable skb frag coalescing and more correct cache > prefetching > > We have a trade-off to make in order to have a unified > implementation and API for page_frag, so use a initial zero > offset in this patch, and the following patch will try to > make some optimization to avoid the disadvantages as much > as possible. > > 1. https://lore.kernel.org/all/f4abe71b3439b39d17a6fb2d410180f367cadf5c.camel@xxxxxxxxx/ > > CC: Alexander Duyck <alexander.duyck@xxxxxxxxx> > Signed-off-by: Yunsheng Lin <linyunsheng@xxxxxxxxxx> > --- > mm/page_frag_cache.c | 46 ++++++++++++++++++++++---------------------- > 1 file changed, 23 insertions(+), 23 deletions(-) > Reviewed-by: Alexander Duyck <alexanderduyck@xxxxxx>
