Re: [RFC PATCH v5 3/4] mm/vmscan: avoid pointless large folio splits without swap
Baolin Wang <[email protected]>
| Newsgroups | gmane.linux.kernel,gmane.linux.kernel.mm,gmane.linux.kernel.cgroups |
|---|---|
| Message-ID | <[email protected]> |
On 7/30/26 8:23 PM, Xueyuan Chen wrote: > From: "Barry Song (Xiaomi)" <[email protected]> > > When swap is disabled, exhausted, or unavailable due to memcg swap > limits, splitting a large anonymous folio cannot make swapout progress. > The fallback only destroys the large folio and inflates split statistics. > > Use -E2BIG from folio_alloc_swap() as the explicit signal that splitting > the folio might allow swapout of smaller pieces. For other allocation > failures, keep the existing activation path and avoid the split. > > This preserves the split fallback for fragmented or partially available > swap, while avoiding it when there is no backing space for any part of the > folio. > > Reported-by: Nanzhe Zhao <[email protected]> > Signed-off-by: Barry Song (Xiaomi) <[email protected]> > Signed-off-by: Xueyuan Chen <[email protected]> > --- LGTM. Feel free to add: Reviewed-by: Baolin Wang <[email protected]>