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| author | Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2012-03-21 16:34:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-03-21 17:55:02 -0700 |
| commit | 8d32ff84401f1addb961c7af2c8d9baceb0ab9ba (patch) | |
| tree | bf62513b239dce072f0105c0b06ed694634a77d4 /mm/memcontrol.c | |
| parent | a488428871265979bcf2c46298a04c1d5826e6cb (diff) | |
| download | linux-8d32ff84401f1addb961c7af2c8d9baceb0ab9ba.tar.gz | |
memcg: clean up existing move charge code
- Replace lengthy function name is_target_pte_for_mc() with a shorter one in order to avoid ugly line breaks. - explicitly use MC_TARGET_* instead of simply using integers. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Hillf Danton <dhillf@gmail.com> Cc: David Rientjes <rientjes@google.com> Acked-by: Hillf Danton <dhillf@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 61102938f119..c8d00a9780bc 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -5110,7 +5110,7 @@ one_by_one: } /** - * is_target_pte_for_mc - check a pte whether it is valid for move charge + * get_mctgt_type - get target type of moving charge * @vma: the vma the pte to be checked belongs * @addr: the address corresponding to the pte to be checked * @ptent: the pte to be checked @@ -5133,7 +5133,7 @@ union mc_target { }; enum mc_target_type { - MC_TARGET_NONE, /* not used */ + MC_TARGET_NONE = 0, MC_TARGET_PAGE, MC_TARGET_SWAP, }; @@ -5214,12 +5214,12 @@ static struct page *mc_handle_file_pte(struct vm_area_struct *vma, return page; } -static int is_target_pte_for_mc(struct vm_area_struct *vma, +static enum mc_target_type get_mctgt_type(struct vm_area_struct *vma, unsigned long addr, pte_t ptent, union mc_target *target) { struct page *page = NULL; struct page_cgroup *pc; - int ret = 0; + enum mc_target_type ret = MC_TARGET_NONE; swp_entry_t ent = { .val = 0 }; if (pte_present(ptent)) @@ -5230,7 +5230,7 @@ static int is_target_pte_for_mc(struct vm_area_struct *vma, page = mc_handle_file_pte(vma, addr, ptent, &ent); if (!page && !ent.val) - return 0; + return ret; if (page) { pc = lookup_page_cgroup(page); /* @@ -5270,7 +5270,7 @@ static int mem_cgroup_count_precharge_pte_range(pmd_t *pmd, pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); for (; addr != end; pte++, addr += PAGE_SIZE) - if (is_target_pte_for_mc(vma, addr, *pte, NULL)) + if (get_mctgt_type(vma, addr, *pte, NULL)) mc.precharge++; /* increment precharge temporarily */ pte_unmap_unlock(pte - 1, ptl); cond_resched(); @@ -5442,8 +5442,7 @@ retry: if (!mc.precharge) break; - type = is_target_pte_for_mc(vma, addr, ptent, &target); - switch (type) { + switch (get_mctgt_type(vma, addr, ptent, &target)) { case MC_TARGET_PAGE: page = target.page; if (isolate_lru_page(page)) @@ -5456,7 +5455,7 @@ retry: mc.moved_charge++; } putback_lru_page(page); -put: /* is_target_pte_for_mc() gets the page */ +put: /* get_mctgt_type() gets the page */ put_page(page); break; case MC_TARGET_SWAP: |