staging: zcache: support multiple clients, prep for KVM and RAMster
This is version 3 of an update to zcache, incorporating feedback from the list. This patch adds support to the in-kernel transcendent memory ("tmem") code and the zcache driver for multiple clients, which will be needed for both RAMster and KVM support. It also adds additional tmem callbacks to support RAMster and corresponding no-op stubs in the zcache driver. In v2, I've also taken the liberty of adding some additional sysfs variables to both surface information and allow policy control. Those experimenting with zcache should find them useful. V3 clarifies some code walking and declaring arrays. Signed-off-by: NDan Magenheimer <dan.magenheimer@oracle.com> [v3: error27@gmail.com: fix array bounds/walking] [v2: konrad.wilk@oracle.com: fix bools, add check for NULL, fix a comment] [v2: sjenning@linux.vnet.ibm.com: add info/tunables for poor compression] [v2: marcusklemm@googlemail.com: add tunable for max persistent pages] Acked-by: NDan Carpenter <error27@gmail.com> Cc: Nitin Gupta <ngupta@vflare.org> Cc: linux-mm@kvack.org Cc: kvm@vger.kernel.org Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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