[PATCH 00/16] tmpfs: HUGEPAGE and MEM_LOCK fcntls and memfds · Hugh Dickins <hughd@google.com> · 2021-07-30
[PATCH 01/16] huge tmpfs: fix fallocate(vanilla) advance over huge pages · Hugh Dickins <hughd@google.com> · 2021-07-30
Re: [PATCH 01/16] huge tmpfs: fix fallocate(vanilla) advance over huge pages · Yang Shi <hidden> · 2021-07-30
Re: [PATCH 01/16] huge tmpfs: fix fallocate(vanilla) advance over huge pages · Hugh Dickins <hughd@google.com> · 2021-08-01
Re: [PATCH 01/16] huge tmpfs: fix fallocate(vanilla) advance over huge pages · Yang Shi <hidden> · 2021-08-02
[PATCH 02/16] huge tmpfs: fix split_huge_page() after FALLOC_FL_KEEP_SIZE · Hugh Dickins <hughd@google.com> · 2021-07-30
Re: [PATCH 02/16] huge tmpfs: fix split_huge_page() after FALLOC_FL_KEEP_SIZE · Yang Shi <hidden> · 2021-07-30
[PATCH 03/16] huge tmpfs: remove shrinklist addition from shmem_setattr() · Hugh Dickins <hughd@google.com> · 2021-07-30
Re: [PATCH 03/16] huge tmpfs: remove shrinklist addition from shmem_setattr() · Yang Shi <hidden> · 2021-07-30
[PATCH 04/16] huge tmpfs: revert shmem's use of transhuge_vma_enabled() · Hugh Dickins <hughd@google.com> · 2021-07-30
Re: [PATCH 04/16] huge tmpfs: revert shmem's use of transhuge_vma_enabled() · Yang Shi <hidden> · 2021-07-30
Re: [PATCH 04/16] huge tmpfs: revert shmem's use of transhuge_vma_enabled() · Hugh Dickins <hughd@google.com> · 2021-08-01
Re: [PATCH 04/16] huge tmpfs: revert shmem's use of transhuge_vma_enabled() · Yang Shi <hidden> · 2021-08-02
[PATCH 05/16] huge tmpfs: move shmem_huge_enabled() upwards · Hugh Dickins <hughd@google.com> · 2021-07-30
Re: [PATCH 05/16] huge tmpfs: move shmem_huge_enabled() upwards · Yang Shi <hidden> · 2021-07-30
[PATCH 06/16] huge tmpfs: shmem_is_huge(vma, inode, index) · Hugh Dickins <hughd@google.com> · 2021-07-30
Re: [PATCH 06/16] huge tmpfs: shmem_is_huge(vma, inode, index) · Yang Shi <hidden> · 2021-07-30
Re: [PATCH 06/16] huge tmpfs: shmem_is_huge(vma, inode, index) · Hugh Dickins <hughd@google.com> · 2021-08-01
Re: [PATCH 06/16] huge tmpfs: shmem_is_huge(vma, inode, index) · Hugh Dickins <hughd@google.com> · 2021-08-01
Re: [PATCH 06/16] huge tmpfs: shmem_is_huge(vma, inode, index) · Yang Shi <hidden> · 2021-08-02
Re: [PATCH 06/16] huge tmpfs: shmem_is_huge(vma, inode, index) · Hugh Dickins <hughd@google.com> · 2021-08-04
Re: [PATCH 06/16] huge tmpfs: shmem_is_huge(vma, inode, index) · Yang Shi <hidden> · 2021-08-04
Re: [PATCH 06/16] huge tmpfs: shmem_is_huge(vma, inode, index) · Hugh Dickins <hughd@google.com> · 2021-08-06
Re: [PATCH 06/16] huge tmpfs: shmem_is_huge(vma, inode, index) · Yang Shi <hidden> · 2021-08-06
Re: [PATCH 06/16] huge tmpfs: shmem_is_huge(vma, inode, index) · Yang Shi <hidden> · 2021-08-05
Re: [PATCH 06/16] huge tmpfs: shmem_is_huge(vma, inode, index) · Hugh Dickins <hughd@google.com> · 2021-08-06
Re: [PATCH 06/16] huge tmpfs: shmem_is_huge(vma, inode, index) · Yang Shi <hidden> · 2021-08-06
Re: [PATCH 06/16] huge tmpfs: shmem_is_huge(vma, inode, index) · Yang Shi <hidden> · 2021-08-12
[PATCH 07/16] memfd: memfd_create(name, MFD_HUGEPAGE) for shmem huge pages · Hugh Dickins <hughd@google.com> · 2021-07-30
Re: [PATCH 07/16] memfd: memfd_create(name, MFD_HUGEPAGE) for shmem huge pages · Kirill A. Shutemov <hidden> · 2021-08-04
Re: [PATCH 07/16] memfd: memfd_create(name, MFD_HUGEPAGE) for shmem huge pages · Hugh Dickins <hughd@google.com> · 2021-08-06
[PATCH 08/16] huge tmpfs: fcntl(fd, F_HUGEPAGE) and fcntl(fd, F_NOHUGEPAGE) · Hugh Dickins <hughd@google.com> · 2021-07-30
Re: [PATCH 08/16] huge tmpfs: fcntl(fd, F_HUGEPAGE) and fcntl(fd, F_NOHUGEPAGE) · Kirill A. Shutemov <hidden> · 2021-08-04
Re: [PATCH 08/16] huge tmpfs: fcntl(fd, F_HUGEPAGE) and fcntl(fd, F_NOHUGEPAGE) · Hugh Dickins <hughd@google.com> · 2021-08-06
[PATCH 09/16] huge tmpfs: decide stat.st_blksize by shmem_is_huge() · Hugh Dickins <hughd@google.com> · 2021-07-30
Re: [PATCH 09/16] huge tmpfs: decide stat.st_blksize by shmem_is_huge() · Yang Shi <hidden> · 2021-07-30
[PATCH 10/16] tmpfs: fcntl(fd, F_MEM_LOCK) to memlock a tmpfs file · Hugh Dickins <hughd@google.com> · 2021-07-30
Re: [PATCH 10/16] tmpfs: fcntl(fd, F_MEM_LOCK) to memlock a tmpfs file · Matthew Wilcox <willy@infradead.org> · 2021-08-03
Re: [PATCH 10/16] tmpfs: fcntl(fd, F_MEM_LOCK) to memlock a tmpfs file · Hugh Dickins <hughd@google.com> · 2021-08-04
[PATCH 11/16] tmpfs: fcntl(fd, F_MEM_LOCKED) to test if memlocked · Hugh Dickins <hughd@google.com> · 2021-07-30
[PATCH 12/16] tmpfs: refuse memlock when fallocated beyond i_size · Hugh Dickins <hughd@google.com> · 2021-07-30
[PATCH 13/16] mm: bool user_shm_lock(loff_t size, struct ucounts *) · Hugh Dickins <hughd@google.com> · 2021-07-30
[PATCH 14/16] mm: user_shm_lock(,,getuc) and user_shm_unlock(,,putuc) · Hugh Dickins <hughd@google.com> · 2021-07-30
[PATCH 15/16] tmpfs: permit changing size of memlocked file · Hugh Dickins <hughd@google.com> · 2021-07-30
[PATCH 16/16] memfd: memfd_create(name, MFD_MEM_LOCK) for memlocked shmem · Hugh Dickins <hughd@google.com> · 2021-07-30

Re: [PATCH 10/16] tmpfs: fcntl(fd, F_MEM_LOCK) to memlock a tmpfs file

From: Matthew Wilcox <willy@infradead.org>
Date: 2021-08-03 01:40:40
Also in: linux-fsdevel, linux-mm, lkml

On Fri, Jul 30, 2021 at 12:55:22AM -0700, Hugh Dickins wrote:

A new uapi to lock the files on tmpfs in memory, to protect against swap
without mapping the files. This commit introduces two new commands to
fcntl and shmem: F_MEM_LOCK and F_MEM_UNLOCK. The locking will be
charged against RLIMIT_MEMLOCK of uid in namespace of the caller.

It's not clear to me why this is limited to shmfs.  Would it not also
make sense for traditional filesystems, eg to force chrome's text pages
to stay in the page cache, no matter how much memory the tabs allocate?

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