Driver porting: Zero-copy user-space access

[rareisme]

http://lwn.net/Articles/28548/

Comments

[kathiawadi]

we are using get_user_pages() in TSA and it was also there in SDP's zcopy path, but we never ported it.. :(

[rareisme]

Basically, i was browsing through mr_register_nonshared code. And they have very well used this function. What we are giving as user buffer in argument is directly mapped to kernel pages in nesproxy code...

[kathiawadi]

yup... but then again we need to make sure that we report back to userspace that the pages are modified under kernel level, using put_page or by setting dirty bit..