Change Details

When we do not anticipate reuse of the pages backing a sendfile() request, it makes sense to allocate them from the NUMA domain which is local to the inpcb backing the socket making the sendfile() request. This is useful to reduce cross-domain traffic in multi-socket systems to at most one cross-domain DMA write from the storage controller to the backing page. Having pages local is especially useful for software kernel TLS, where the pages may be accessed by the CPU. This change: - adds domain awareness to sendfile() when SF_NOCACHE is set - adds a domain argument to sendfile_swapin() - converts vm_grab_pages() into vm_grab_pages_domain() so that backing pages from the specified domain can be allocated by sendfile. vm_grab_pages() is preserved as a wrapper.

When we do not anticipate reuse of the pages backing a sendfile() request, it makes sense to allocate them from the NUMA domain which is local to the inpcb backing the socket making the sendfile() request. This is useful to reduce cross-domain traffic in multi-socket systems to at most one cross-domain DMA write from the storage controller to the backing page. Having pages local is especially useful for software kernel TLS, where the pages may be accessed by the CPU. This change adds domain awareness to sendfile() when SF_NOCACHE is set

When we do not anticipate reuse of the pages backing a sendfile() request, it makes sense to allocate them from the NUMA domain which is local to the inpcb backing the socket making the sendfile() request. This is useful to reduce cross-domain traffic in multi-socket systems to at most one cross-domain DMA write from the storage controller to the backing page. Having pages local is especially useful for software kernel TLS, where the pages may be accessed by the CPU. This change: - adds domain awareness to sendfile() when SF_NOCACHE is set - adds a domain argument to sendfile_swapin() - converts vm_grab_pages() into vm_grab_pages_domain() so that backing pages from the specified domain can be allocated by sendfile. vm_grab_pages() is preserved as a wrapper.