On Thu, Jan 30, 2025 at 05:34:18PM -0800, Dave Hansen wrote:
> On 1/30/25 16:56, Kent Overstreet wrote:
> > On Thu, Jan 30, 2025 at 08:04:49AM -0800, Dave Hansen wrote:...
> >> Any suggestions for fully describing the situation? I tried to sprinkle
> >> comments liberally but I'm also painfully awa
On 1/30/25 16:56, Kent Overstreet wrote:
> On Thu, Jan 30, 2025 at 08:04:49AM -0800, Dave Hansen wrote:...
>> Any suggestions for fully describing the situation? I tried to sprinkle
>> comments liberally but I'm also painfully aware that I'm not doing a
>> perfect job of talking about the fs code.
On Fri, Jan 31, 2025 at 08:36:29AM +1100, Dave Chinner wrote:
> On Thu, Jan 30, 2025 at 08:04:49AM -0800, Dave Hansen wrote:
> > On 1/29/25 23:44, Kent Overstreet wrote:
> > > On Wed, Jan 29, 2025 at 10:17:49AM -0800, Dave Hansen wrote:
> > >> tl;dr: The VFS and several filesystems have some suspec
On Thu, Jan 30, 2025 at 08:04:49AM -0800, Dave Hansen wrote:
> On 1/29/25 23:44, Kent Overstreet wrote:
> > On Wed, Jan 29, 2025 at 10:17:49AM -0800, Dave Hansen wrote:
> >> tl;dr: The VFS and several filesystems have some suspect prefaulting
> >> code. It is unnecessarily slow for the common case
On Thu, Jan 30, 2025 at 08:04:49AM -0800, Dave Hansen wrote:
> On 1/29/25 23:44, Kent Overstreet wrote:
> > On Wed, Jan 29, 2025 at 10:17:49AM -0800, Dave Hansen wrote:
> >> tl;dr: The VFS and several filesystems have some suspect prefaulting
> >> code. It is unnecessarily slow for the common case
On 1/29/25 23:44, Kent Overstreet wrote:
> On Wed, Jan 29, 2025 at 10:17:49AM -0800, Dave Hansen wrote:
>> tl;dr: The VFS and several filesystems have some suspect prefaulting
>> code. It is unnecessarily slow for the common case where a write's
>> source buffer is resident and does not need to be
On Wed, Jan 29, 2025 at 10:17:49AM -0800, Dave Hansen wrote:
> tl;dr: The VFS and several filesystems have some suspect prefaulting
> code. It is unnecessarily slow for the common case where a write's
> source buffer is resident and does not need to be faulted in.
>
> Move these "prefaulting" oper
tl;dr: The VFS and several filesystems have some suspect prefaulting
code. It is unnecessarily slow for the common case where a write's
source buffer is resident and does not need to be faulted in.
Move these "prefaulting" operations to slow paths where they ensure
forward progress but they do not
