The patch titled ksm: change the KSM_REMOVE_MEMORY_REGION ioctl. has been added to the -mm tree. Its filename is ksm-add-ksm-kernel-shared-memory-driver-change-the-ksm_remove_memory_region-ioctl.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: ksm: change the KSM_REMOVE_MEMORY_REGION ioctl. From: Izik Eidus <ieidus@xxxxxxxxxx> This patch change the KSM_REMOVE_MEMORY_REGION ioctl to be specific per memory region (instead of flushing all the registred memory regions inside the file descriptor like it happen now) The previoes api was: user register memory regions using KSM_REGISTER_MEMORY_REGION inside the fd, and then when he wanted to remove just one memory region, he had to remove them all using KSM_REMOVE_MEMORY_REGION. This patch change this beahivor by chaning the KSM_REMOVE_MEMORY_REGION ioctl to recive another paramter that it is the begining of the virtual address that is wanted to be removed. (user can still remove all the memory regions all at once, by just closing the file descriptor) Signed-off-by: Izik Eidus <ieidus@xxxxxxxxxx> Cc: Chris Wright <chrisw@xxxxxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Cc: Avi Kivity <avi@xxxxxxxxxx> Cc: Hugh Dickins <hugh@xxxxxxxxxxx> Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/ksm.c | 45 ++++++++++++++++++++++++++------------------- 1 file changed, 26 insertions(+), 19 deletions(-) diff -puN mm/ksm.c~ksm-add-ksm-kernel-shared-memory-driver-change-the-ksm_remove_memory_region-ioctl mm/ksm.c --- a/mm/ksm.c~ksm-add-ksm-kernel-shared-memory-driver-change-the-ksm_remove_memory_region-ioctl +++ a/mm/ksm.c @@ -542,48 +542,55 @@ out: return ret; } -static void remove_mm_from_hash_and_tree(struct mm_struct *mm) +static void remove_slot_from_hash_and_tree(struct ksm_mem_slot *slot) { - struct ksm_mem_slot *slot; int pages_count; - list_for_each_entry(slot, &slots, link) - if (slot->mm == mm) - break; - BUG_ON(!slot); - root_unstable_tree = RB_ROOT; for (pages_count = 0; pages_count < slot->npages; ++pages_count) - remove_page_from_tree(mm, slot->addr + + remove_page_from_tree(slot->mm, slot->addr + pages_count * PAGE_SIZE); /* Called under slots_lock */ list_del(&slot->link); } -static int ksm_sma_ioctl_remove_memory_region(struct ksm_sma *ksm_sma) +static int ksm_sma_ioctl_remove_memory_region(struct ksm_sma *ksm_sma, + unsigned long addr) { + int ret = -EFAULT; struct ksm_mem_slot *slot, *node; down_write(&slots_lock); list_for_each_entry_safe(slot, node, &ksm_sma->sma_slots, sma_link) { - remove_mm_from_hash_and_tree(slot->mm); - mmput(slot->mm); - list_del(&slot->sma_link); - kfree(slot); - ksm_sma->nregions--; + if (addr == slot->addr) { + remove_slot_from_hash_and_tree(slot); + mmput(slot->mm); + list_del(&slot->sma_link); + kfree(slot); + ksm_sma->nregions--; + ret = 0; + } } up_write(&slots_lock); - return 0; + return ret; } static int ksm_sma_release(struct inode *inode, struct file *filp) { + struct ksm_mem_slot *slot, *node; struct ksm_sma *ksm_sma = filp->private_data; - int r; - r = ksm_sma_ioctl_remove_memory_region(ksm_sma); + down_write(&slots_lock); + list_for_each_entry_safe(slot, node, &ksm_sma->sma_slots, sma_link) { + remove_slot_from_hash_and_tree(slot); + mmput(slot->mm); + list_del(&slot->sma_link); + kfree(slot); + } + up_write(&slots_lock); + kfree(ksm_sma); - return r; + return 0; } static long ksm_sma_ioctl(struct file *filp, @@ -606,7 +613,7 @@ static long ksm_sma_ioctl(struct file *f break; } case KSM_REMOVE_MEMORY_REGION: - r = ksm_sma_ioctl_remove_memory_region(sma); + r = ksm_sma_ioctl_remove_memory_region(sma, arg); break; } _ Patches currently in -mm which might be from ieidus@xxxxxxxxxx are linux-next.patch ksm-mmu_notifiers-add-set_pte_at_notify.patch ksm-add-get_pte-helper-function-fetching-pte-for-va.patch ksm-add-get_pte-helper-function-fetching-pte-for-va-fix.patch ksm-add-page_wrprotect-write-protecting-page.patch ksm-add-replace_page-change-the-page-pte-is-pointing-to.patch ksm-add-ksm-kernel-shared-memory-driver.patch ksm-add-ksm-kernel-shared-memory-driver-checkpatch-fixes.patch ksm-add-ksm-kernel-shared-memory-driver-fix-unsafe-pte-fetching.patch ksm-add-ksm-kernel-shared-memory-driver-fix.patch ksm-add-ksm-kernel-shared-memory-driver-limiting-the-num-of-mem-regions-user-can-register-per-fd.patch ksm-add-ksm-kernel-shared-memory-driver-dont-allow-overlap-memory-addresses-registrations.patch ksm-add-ksm-kernel-shared-memory-driver-change-the-ksm_remove_memory_region-ioctl.patch ksm-add-ksm-kernel-shared-memory-driver-change-the-prot-handling-to-use-the-generic-helper-functions.patch ksm-add-ksm-kernel-shared-memory-driver-use-another-miscdevice-minor-number.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