| commit | 250a41e0ecc433cdd553a364d0fc74c766425209 | |
| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | |
| Fri, 17 Aug 2012 13:27:35 +0000 (17 09:27 -0400) | ||
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | |
| Fri, 17 Aug 2012 13:29:15 +0000 (17 09:29 -0400) | ||
| tree | 2ccf2047360e0729f20b45010c9e160bd35862c3 | treesnapshot (tar.gz zip) |
| parent | ca08649eb5dd30f11a5a8fe8659b48899b7ea6a1 | commitdiff |
xen/p2m: Reuse existing P2M leafs if they are filled with 1:1 PFNs or INVALID.
If P2M leaf is completly packed with INVALID_P2M_ENTRY or with
1:1 PFNs (so IDENTITY_FRAME type PFNs), we can swap the P2M leaf
with either a p2m_missing or p2m_identity respectively. The old
page (which was created via extend_brk or was grafted on from the
mfn_list) can be re-used for setting new PFNs.
This also means we can remove git commit:
5bc6f9888db5739abfa0cae279b4b442e4db8049
xen/p2m: Reserve 8MB of _brk space for P2M leafs when populating back
which tried to fix this.
and make the amount that is required to be reserved much smaller.
CC: stable@vger.kernel.org # for 3.5 only.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
If P2M leaf is completly packed with INVALID_P2M_ENTRY or with
1:1 PFNs (so IDENTITY_FRAME type PFNs), we can swap the P2M leaf
with either a p2m_missing or p2m_identity respectively. The old
page (which was created via extend_brk or was grafted on from the
mfn_list) can be re-used for setting new PFNs.
This also means we can remove git commit:
5bc6f9888db5739abfa0cae279b4b442e4db8049
xen/p2m: Reserve 8MB of _brk space for P2M leafs when populating back
which tried to fix this.
and make the amount that is required to be reserved much smaller.
CC: stable@vger.kernel.org # for 3.5 only.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
| arch/x86/xen/p2m.c | diffblobblamehistory |