[Qemu-devel] [PATCH] migration: drop MADVISE_DONT_NEED for incoming zero pages

2013-10-07 Thread Peter Lieven
The madvise for zeroed out pages was introduced when every transferred zero page was memset to zero and thus allocated. Since commit 211ea740 we check for zeroness of a target page before we memset it to zero. Additionally we memmap target memory so it is essentially zero initalized (except for

Re: [Qemu-devel] [PATCH] migration: drop MADVISE_DONT_NEED for incoming zero pages

2013-10-07 Thread Paolo Bonzini
Il 07/10/2013 11:22, Peter Lieven ha scritto: The madvise for zeroed out pages was introduced when every transferred zero page was memset to zero and thus allocated. Since commit 211ea740 we check for zeroness of a target page before we memset it to zero. Additionally we memmap target memory

Re: [Qemu-devel] [PATCH] migration: drop MADVISE_DONT_NEED for incoming zero pages

2013-10-07 Thread Andreas Färber
Am 07.10.2013 11:22, schrieb Peter Lieven: The madvise for zeroed out pages was introduced when every transferred zero page was memset to zero and thus allocated. Since commit 211ea740 we check for zeroness of a target page before we memset it to zero. Additionally we memmap target memory so