On Wed, Apr 07, 2021 at 02:46:11PM -0700, Daniel Xu wrote:
> This commit introduces the bpf page cache iterator. This iterator allows
> users to run a bpf prog against each page in the "page cache".
> Internally, the "page cache" is extremely tied to VFS superblock + inode
> combo. Because of
On Thu, Apr 08, 2021 at 12:48:49PM -0700, Daniel Xu wrote:
> No reason other than I didn't know about the latter. Thanks for the
> hint. find_get_entries() seems to return a pagevec of entries which
> would complicate the iteration (a 4th layer of things to iterate over).
>
> But I did find
On Thu, Apr 08, 2021 at 01:49:35PM -0700, Daniel Xu wrote:
> Ah right, sorry. Nobody will clean up the super_block.
>
> > IOW, NAK. The objects you are playing with have non-trivial lifecycle
> > and poking into the guts of data structures without bothering to
> > understand it is not a good
On Thu, Apr 08, 2021 at 04:45:37PM +, Al Viro wrote:
> On Wed, Apr 07, 2021 at 02:46:11PM -0700, Daniel Xu wrote:
>
> > +static void fini_seq_pagecache(void *priv_data)
> > +{
> > + struct bpf_iter_seq_pagecache_info *info = priv_data;
> > + struct radix_tree_iter iter;
> > + struct
On Thu, Apr 08, 2021 at 10:19:35AM +0200, Christian Brauner wrote:
> On Wed, Apr 07, 2021 at 02:46:11PM -0700, Daniel Xu wrote:
> > This commit introduces the bpf page cache iterator. This iterator allows
> > users to run a bpf prog against each page in the "page cache".
> > Internally, the "page
On Thu, Apr 08, 2021 at 07:14:01AM +0100, Matthew Wilcox wrote:
> On Wed, Apr 07, 2021 at 02:46:11PM -0700, Daniel Xu wrote:
> > +struct bpf_iter_seq_pagecache_info {
> > + struct mnt_namespace *ns;
> > + struct radix_tree_root superblocks;
>
> Why are you adding a new radix tree? Use an
On Wed, Apr 07, 2021 at 02:46:11PM -0700, Daniel Xu wrote:
> +static void fini_seq_pagecache(void *priv_data)
> +{
> + struct bpf_iter_seq_pagecache_info *info = priv_data;
> + struct radix_tree_iter iter;
> + struct super_block *sb;
> + void **slot;
> +
> +
On Wed, Apr 07, 2021 at 02:46:11PM -0700, Daniel Xu wrote:
> This commit introduces the bpf page cache iterator. This iterator allows
> users to run a bpf prog against each page in the "page cache".
> Internally, the "page cache" is extremely tied to VFS superblock + inode
> combo. Because of
On Wed, Apr 07, 2021 at 02:46:11PM -0700, Daniel Xu wrote:
> +struct bpf_iter_seq_pagecache_info {
> + struct mnt_namespace *ns;
> + struct radix_tree_root superblocks;
Why are you adding a new radix tree? Use an XArray instead.
> +static struct page *goto_next_page(struct
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