Changes since v1: - Add VmFile and VmAnon line to /proc/<pid>/status. - Split first patch: new accounting code on one side and and adding new fields to status on the other. - Remove ShmOther and ShmSwapCache from smaps and rename ShmOrphan to ShmNotMapped. - Drop fourth patch "mm, shmem: Add shmem swap memory accounting". - Minor implementation details. I also tried again to come to a better way to account for shmem swap pages, but my effort were again unsuccessful. Any suggestion is gladly welcome. There are several shortcomings with the accounting of shared memory (sysV shm, shared anonymous mapping, mapping to a tmpfs file). The values in /proc/<pid>/status and statm don't allow to distinguish between shmem memory and a shared mapping to a regular file, even though theirs implication on memory usage are quite different: at reclaim, file mapping can be dropped or write back on disk while shmem needs a place in swap. As for shmem pages that are swapped-out or in swap cache, they aren't accounted at all. This series addresses these issues by adding new fields to status and smaps file in /proc/<pid>/. The accounting of resident shared memory is made in the same way as it's currently done for resident memory and general swap (a counter in mm_rss_stat), but this approach proved impractical for paged-out shared memory (it would requires a rmap walk each time a page is paged-in). /proc/<pid>/smaps also lacks proper accounting of shared memory since shmem subsystem hides all implementation detail to generic mm code. This series adds the shmem_locate() function that returns the location of a particular page (resident, in swap or swap cache). Called from smaps code, it allows to show more detailled accounting of shmem mappings in smaps. Patch 1 adds a counter to keep track of resident shmem memory. Patch 2 adds VmFile, VmAnon and VmShm lines to /proc/<pid>/status. Patch 3 adds a function to allow generic code to know the physical location of a shmem page. Patch 4 adds simple helper function. Patch 5 adds shmem specific fields to /proc/<pid>/smaps. Thanks, Jerome Jerome Marchand (5): mm, shmem: Add shmem resident memory accounting mm, procfs: Display VmAnon, VmFile and VmShm in /proc/pid/status mm, shmem: Add shmem_locate function mm, shmem: Add shmem_vma() helper mm, shmem: Show location of non-resident shmem pages in smaps Documentation/filesystems/proc.txt | 16 +++++++++- arch/s390/mm/pgtable.c | 5 +--- fs/proc/task_mmu.c | 60 ++++++++++++++++++++++++++++++++++++-- include/linux/mm.h | 10 +++++++ include/linux/mm_types.h | 7 +++-- include/linux/shmem_fs.h | 7 +++++ kernel/events/uprobes.c | 2 +- mm/filemap_xip.c | 2 +- mm/memory.c | 28 +++++------------- mm/oom_kill.c | 5 ++-- mm/rmap.c | 17 ++++------- mm/shmem.c | 35 ++++++++++++++++++++++ 12 files changed, 147 insertions(+), 47 deletions(-) -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
