The patch titled mm: reintroduce and deprecate rlimit based access for SHM_HUGETLB has been added to the -mm tree. Its filename is mm-reintroduce-and-deprecate-rlimit-based-access-for-shm_hugetlb.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: mm: reintroduce and deprecate rlimit based access for SHM_HUGETLB From: Ravikiran G Thirumalai <kiran@xxxxxxxxxxxx> Allow non root users with sufficient mlock rlimits to be able to allocate hugetlb backed shm for now. Deprecate this though. This is being deprecated because the mlock based rlimit checks for SHM_HUGETLB is not consistent with mmap based huge page allocations. Signed-off-by: Ravikiran Thirumalai <kiran@xxxxxxxxxxxx> Reviewed-by: Mel Gorman <mel@xxxxxxxxx> Cc: William Lee Irwin III <wli@xxxxxxxxxxxxxx> Cc: Adam Litke <agl@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- Documentation/feature-removal-schedule.txt | 12 ++++++++++++ fs/hugetlbfs/inode.c | 13 +++++++++++-- 2 files changed, 23 insertions(+), 2 deletions(-) diff -puN Documentation/feature-removal-schedule.txt~mm-reintroduce-and-deprecate-rlimit-based-access-for-shm_hugetlb Documentation/feature-removal-schedule.txt --- a/Documentation/feature-removal-schedule.txt~mm-reintroduce-and-deprecate-rlimit-based-access-for-shm_hugetlb +++ a/Documentation/feature-removal-schedule.txt @@ -284,6 +284,18 @@ Who: Vlad Yasevich <vladislav.yasevich@h --------------------------- +What: Ability for non root users to shm_get hugetlb pages based on mlock + resource limits +When: 2.6.31 +Why: Non root users need to be part of /proc/sys/vm/hugetlb_shm_group or + have CAP_IPC_LOCK to be able to allocate shm segments backed by + huge pages. The mlock based rlimit check to allow shm hugetlb is + inconsistent with mmap based allocations. Hence it is being + deprecated. +Who: Ravikiran Thirumalai <kiran@xxxxxxxxxxxx> + +--------------------------- + What: CONFIG_THERMAL_HWMON When: January 2009 Why: This option was introduced just to allow older lm-sensors userspace diff -puN fs/hugetlbfs/inode.c~mm-reintroduce-and-deprecate-rlimit-based-access-for-shm_hugetlb fs/hugetlbfs/inode.c --- a/fs/hugetlbfs/inode.c~mm-reintroduce-and-deprecate-rlimit-based-access-for-shm_hugetlb +++ a/fs/hugetlbfs/inode.c @@ -949,6 +949,7 @@ static int can_do_hugetlb_shm(void) struct file *hugetlb_file_setup(const char *name, size_t size, int acctflag) { int error = -ENOMEM; + int unlock_shm = 0; struct file *file; struct inode *inode; struct dentry *dentry, *root; @@ -958,8 +959,14 @@ struct file *hugetlb_file_setup(const ch if (!hugetlbfs_vfsmount) return ERR_PTR(-ENOENT); - if (!can_do_hugetlb_shm()) - return ERR_PTR(-EPERM); + if (!can_do_hugetlb_shm()) { + if (user_shm_lock(size, user)) { + unlock_shm = 1; + WARN_ONCE(1, + "Using mlock ulimits for SHM_HUGETLB deprecated\n"); + } else + return ERR_PTR(-EPERM); + } root = hugetlbfs_vfsmount->mnt_root; quick_string.name = name; @@ -999,6 +1006,8 @@ out_inode: out_dentry: dput(dentry); out_shm_unlock: + if (unlock_shm) + user_shm_unlock(size, user); return ERR_PTR(error); } _ Patches currently in -mm which might be from kiran@xxxxxxxxxxxx are linux-next.patch mm-fix-shm_hugetlb-to-work-with-users-in-hugetlb_shm_group.patch mm-reintroduce-and-deprecate-rlimit-based-access-for-shm_hugetlb.patch slab-leaks3-default-y.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html