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    Subject[PATCH 21/31] huge tmpfs: show page team flag in pageflags
    From: Andres Lagar-Cavilla <andreslc@google.com>

    For debugging and testing.

    Signed-off-by: Andres Lagar-Cavilla <andreslc@google.com>
    Signed-off-by: Hugh Dickins <hughd@google.com>
    ---
    This patchset has been based on v4.6-rc2: here we get a clash with
    the addition of KPF_MOVABLE in current mmotm, not hard to fix up.

    Documentation/vm/pagemap.txt | 2 ++
    fs/proc/page.c | 6 ++++++
    include/uapi/linux/kernel-page-flags.h | 3 ++-
    tools/vm/page-types.c | 2 ++
    4 files changed, 12 insertions(+), 1 deletion(-)

    --- a/Documentation/vm/pagemap.txt
    +++ b/Documentation/vm/pagemap.txt
    @@ -71,6 +71,8 @@ There are four components to pagemap:
    23. BALLOON
    24. ZERO_PAGE
    25. IDLE
    + 26. TEAM
    + 27. TEAM_PMD_MMAP (only if the whole team is mapped as a pmd at least once)

    * /proc/kpagecgroup. This file contains a 64-bit inode number of the
    memory cgroup each page is charged to, indexed by PFN. Only available when
    --- a/fs/proc/page.c
    +++ b/fs/proc/page.c
    @@ -12,6 +12,7 @@
    #include <linux/memcontrol.h>
    #include <linux/mmu_notifier.h>
    #include <linux/page_idle.h>
    +#include <linux/pageteam.h>
    #include <linux/kernel-page-flags.h>
    #include <asm/uaccess.h>
    #include "internal.h"
    @@ -112,6 +113,11 @@ u64 stable_page_flags(struct page *page)
    if (PageKsm(page))
    u |= 1 << KPF_KSM;

    + if (PageTeam(page)) {
    + u |= 1 << KPF_TEAM;
    + if (page == team_head(page) && team_pmd_mapped(page))
    + u |= 1 << KPF_TEAM_PMD_MMAP;
    + }
    /*
    * compound pages: export both head/tail info
    * they together define a compound page's start/end pos and order
    --- a/include/uapi/linux/kernel-page-flags.h
    +++ b/include/uapi/linux/kernel-page-flags.h
    @@ -34,6 +34,7 @@
    #define KPF_BALLOON 23
    #define KPF_ZERO_PAGE 24
    #define KPF_IDLE 25
    -
    +#define KPF_TEAM 26
    +#define KPF_TEAM_PMD_MMAP 27

    #endif /* _UAPILINUX_KERNEL_PAGE_FLAGS_H */
    --- a/tools/vm/page-types.c
    +++ b/tools/vm/page-types.c
    @@ -133,6 +133,8 @@ static const char * const page_flag_name
    [KPF_BALLOON] = "o:balloon",
    [KPF_ZERO_PAGE] = "z:zero_page",
    [KPF_IDLE] = "i:idle_page",
    + [KPF_TEAM] = "y:team",
    + [KPF_TEAM_PMD_MMAP] = "Y:team_pmd_mmap",

    [KPF_RESERVED] = "r:reserved",
    [KPF_MLOCKED] = "m:mlocked",
    \
     
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      Last update: 2016-04-06 00:01    [W:4.354 / U:0.020 seconds]
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