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    Subject[PATCH v5 8/9] mm/swap: Enable swap slots cache usage
    Date
    Initialize swap slots cache and enable it on swap on.
    Drain all swap slots on swap off.

    Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
    ---
    mm/swapfile.c | 7 +++++++
    1 file changed, 7 insertions(+)

    diff --git a/mm/swapfile.c b/mm/swapfile.c
    index e6c30ed..14d9ea2 100644
    --- a/mm/swapfile.c
    +++ b/mm/swapfile.c
    @@ -2181,6 +2181,8 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
    spin_unlock(&p->lock);
    spin_unlock(&swap_lock);

    + disable_swap_slots_cache_lock();
    +
    set_current_oom_origin();
    err = try_to_unuse(p->type, false, 0); /* force unuse all pages */
    clear_current_oom_origin();
    @@ -2188,9 +2190,12 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
    if (err) {
    /* re-insert swap space back into swap_list */
    reinsert_swap_info(p);
    + reenable_swap_slots_cache_unlock();
    goto out_dput;
    }

    + reenable_swap_slots_cache_unlock();
    +
    flush_work(&p->discard_work);

    destroy_swap_extents(p);
    @@ -2868,6 +2873,8 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
    putname(name);
    if (inode && S_ISREG(inode->i_mode))
    inode_unlock(inode);
    + if (!error)
    + enable_swap_slots_cache();
    return error;
    }

    --
    2.5.5
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