From: Dave Hansen <dave@linux.vnet.ibm.com> To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, Michael J Wolf <mjwolf@us.ibm.com>, Andrea Arcangeli <aarcange@redhat.com>, Dave Hansen <dave@linux.vnet.ibm.com> Subject: [RFC][PATCH 5/6] teach smaps_pte_range() about THP pmds Date: Mon, 31 Jan 2011 16:34:03 -0800 [thread overview] Message-ID: <20110201003403.736A24DF@kernel> (raw) In-Reply-To: <20110201003357.D6F0BE0D@kernel> This adds code to explicitly detect and handle pmd_trans_huge() pmds. It then passes HPAGE_SIZE units in to the smap_pte_entry() function instead of PAGE_SIZE. This means that using /proc/$pid/smaps now will no longer cause THPs to be broken down in to small pages. Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com> --- linux-2.6.git-dave/fs/proc/task_mmu.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff -puN fs/proc/task_mmu.c~teach-smaps_pte_range-about-thp-pmds fs/proc/task_mmu.c --- linux-2.6.git/fs/proc/task_mmu.c~teach-smaps_pte_range-about-thp-pmds 2011-01-31 15:10:55.387856566 -0800 +++ linux-2.6.git-dave/fs/proc/task_mmu.c 2011-01-31 15:25:12.231239775 -0800 @@ -1,5 +1,6 @@ #include <linux/mm.h> #include <linux/hugetlb.h> +#include <linux/huge_mm.h> #include <linux/mount.h> #include <linux/seq_file.h> #include <linux/highmem.h> @@ -385,6 +386,17 @@ static int smaps_pte_range(pmd_t *pmd, u pte_t *pte; spinlock_t *ptl; + if (pmd_trans_huge(*pmd)) { + if (pmd_trans_splitting(*pmd)) { + spin_unlock(&walk->mm->page_table_lock); + wait_split_huge_page(vma->anon_vma, pmd); + spin_lock(&walk->mm->page_table_lock); + goto normal_ptes; + } + smaps_pte_entry(*(pte_t *)pmd, addr, HPAGE_SIZE, walk); + return 0; + } +normal_ptes: split_huge_page_pmd(walk->mm, pmd); pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); diff -puN mm/vmscan.c~teach-smaps_pte_range-about-thp-pmds mm/vmscan.c diff -puN include/trace/events/vmscan.h~teach-smaps_pte_range-about-thp-pmds include/trace/events/vmscan.h diff -puN mm/pagewalk.c~teach-smaps_pte_range-about-thp-pmds mm/pagewalk.c diff -puN mm/huge_memory.c~teach-smaps_pte_range-about-thp-pmds mm/huge_memory.c diff -puN mm/memory.c~teach-smaps_pte_range-about-thp-pmds mm/memory.c diff -puN include/linux/huge_mm.h~teach-smaps_pte_range-about-thp-pmds include/linux/huge_mm.h diff -puN mm/internal.h~teach-smaps_pte_range-about-thp-pmds mm/internal.h _
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave@linux.vnet.ibm.com> To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, Michael J Wolf <mjwolf@us.ibm.com>, Andrea Arcangeli <aarcange@redhat.com>, Dave Hansen <dave@linux.vnet.ibm.com> Subject: [RFC][PATCH 5/6] teach smaps_pte_range() about THP pmds Date: Mon, 31 Jan 2011 16:34:03 -0800 [thread overview] Message-ID: <20110201003403.736A24DF@kernel> (raw) In-Reply-To: <20110201003357.D6F0BE0D@kernel> This adds code to explicitly detect and handle pmd_trans_huge() pmds. It then passes HPAGE_SIZE units in to the smap_pte_entry() function instead of PAGE_SIZE. This means that using /proc/$pid/smaps now will no longer cause THPs to be broken down in to small pages. Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com> --- linux-2.6.git-dave/fs/proc/task_mmu.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff -puN fs/proc/task_mmu.c~teach-smaps_pte_range-about-thp-pmds fs/proc/task_mmu.c --- linux-2.6.git/fs/proc/task_mmu.c~teach-smaps_pte_range-about-thp-pmds 2011-01-31 15:10:55.387856566 -0800 +++ linux-2.6.git-dave/fs/proc/task_mmu.c 2011-01-31 15:25:12.231239775 -0800 @@ -1,5 +1,6 @@ #include <linux/mm.h> #include <linux/hugetlb.h> +#include <linux/huge_mm.h> #include <linux/mount.h> #include <linux/seq_file.h> #include <linux/highmem.h> @@ -385,6 +386,17 @@ static int smaps_pte_range(pmd_t *pmd, u pte_t *pte; spinlock_t *ptl; + if (pmd_trans_huge(*pmd)) { + if (pmd_trans_splitting(*pmd)) { + spin_unlock(&walk->mm->page_table_lock); + wait_split_huge_page(vma->anon_vma, pmd); + spin_lock(&walk->mm->page_table_lock); + goto normal_ptes; + } + smaps_pte_entry(*(pte_t *)pmd, addr, HPAGE_SIZE, walk); + return 0; + } +normal_ptes: split_huge_page_pmd(walk->mm, pmd); pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); diff -puN mm/vmscan.c~teach-smaps_pte_range-about-thp-pmds mm/vmscan.c diff -puN include/trace/events/vmscan.h~teach-smaps_pte_range-about-thp-pmds include/trace/events/vmscan.h diff -puN mm/pagewalk.c~teach-smaps_pte_range-about-thp-pmds mm/pagewalk.c diff -puN mm/huge_memory.c~teach-smaps_pte_range-about-thp-pmds mm/huge_memory.c diff -puN mm/memory.c~teach-smaps_pte_range-about-thp-pmds mm/memory.c diff -puN include/linux/huge_mm.h~teach-smaps_pte_range-about-thp-pmds include/linux/huge_mm.h diff -puN mm/internal.h~teach-smaps_pte_range-about-thp-pmds mm/internal.h _ -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2011-02-01 0:34 UTC|newest] Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-02-01 0:33 [RFC][PATCH 0/6] more detailed per-process transparent hugepage statistics Dave Hansen 2011-02-01 0:33 ` Dave Hansen 2011-02-01 0:33 ` [RFC][PATCH 1/6] count transparent hugepage splits Dave Hansen 2011-02-01 0:33 ` Dave Hansen 2011-02-01 9:58 ` Johannes Weiner 2011-02-01 9:58 ` Johannes Weiner 2011-02-03 21:22 ` David Rientjes 2011-02-03 21:22 ` David Rientjes 2011-02-04 21:18 ` Andrea Arcangeli 2011-02-04 21:18 ` Andrea Arcangeli 2011-02-04 21:28 ` Dave Hansen 2011-02-04 21:28 ` Dave Hansen 2011-02-01 0:33 ` [RFC][PATCH 2/6] pagewalk: only split huge pages when necessary Dave Hansen 2011-02-01 0:33 ` Dave Hansen 2011-02-01 10:04 ` Johannes Weiner 2011-02-01 10:04 ` Johannes Weiner 2011-02-01 15:03 ` Dave Hansen 2011-02-01 15:03 ` Dave Hansen 2011-02-03 21:22 ` David Rientjes 2011-02-03 21:22 ` David Rientjes 2011-02-03 21:33 ` Dave Hansen 2011-02-03 21:33 ` Dave Hansen 2011-02-03 21:46 ` David Rientjes 2011-02-03 21:46 ` David Rientjes 2011-02-04 17:19 ` Dave Hansen 2011-02-04 17:19 ` Dave Hansen 2011-02-04 21:10 ` Andrea Arcangeli 2011-02-04 21:10 ` Andrea Arcangeli 2011-02-01 0:34 ` [RFC][PATCH 3/6] break out smaps_pte_entry() from smaps_pte_range() Dave Hansen 2011-02-01 0:34 ` Dave Hansen 2011-02-01 10:08 ` Johannes Weiner 2011-02-01 10:08 ` Johannes Weiner 2011-02-03 21:22 ` David Rientjes 2011-02-03 21:22 ` David Rientjes 2011-02-03 21:40 ` Dave Hansen 2011-02-03 21:40 ` Dave Hansen 2011-02-01 0:34 ` [RFC][PATCH 4/6] pass pte size argument in to smaps_pte_entry() Dave Hansen 2011-02-01 0:34 ` Dave Hansen 2011-02-01 10:09 ` Johannes Weiner 2011-02-01 10:09 ` Johannes Weiner 2011-02-03 21:22 ` David Rientjes 2011-02-03 21:22 ` David Rientjes 2011-02-01 0:34 ` Dave Hansen [this message] 2011-02-01 0:34 ` [RFC][PATCH 5/6] teach smaps_pte_range() about THP pmds Dave Hansen 2011-02-01 10:11 ` Johannes Weiner 2011-02-01 10:11 ` Johannes Weiner 2011-02-01 15:02 ` Dave Hansen 2011-02-01 15:02 ` Dave Hansen 2011-02-01 16:09 ` Andrea Arcangeli 2011-02-01 16:09 ` Andrea Arcangeli 2011-02-03 21:22 ` David Rientjes 2011-02-03 21:22 ` David Rientjes 2011-02-03 21:34 ` Dave Hansen 2011-02-03 21:34 ` Dave Hansen 2011-02-01 0:34 ` [RFC][PATCH 6/6] have smaps show transparent huge pages Dave Hansen 2011-02-01 0:34 ` Dave Hansen 2011-02-01 10:12 ` Johannes Weiner 2011-02-01 10:12 ` Johannes Weiner 2011-02-03 21:22 ` David Rientjes 2011-02-03 21:22 ` David Rientjes 2011-02-01 15:38 ` [RFC][PATCH 0/6] more detailed per-process transparent hugepage statistics Andrea Arcangeli 2011-02-01 15:38 ` Andrea Arcangeli 2011-02-01 17:15 ` Dave Hansen 2011-02-01 17:15 ` Dave Hansen 2011-02-01 20:39 ` Andrea Arcangeli 2011-02-01 20:39 ` Andrea Arcangeli 2011-02-01 20:56 ` Dave Hansen 2011-02-01 20:56 ` Dave Hansen 2011-02-02 0:07 ` Andrea Arcangeli 2011-02-02 0:07 ` Andrea Arcangeli 2011-02-08 17:54 ` Dave Hansen 2011-02-08 17:54 ` Dave Hansen 2011-02-08 18:17 ` Andrea Arcangeli 2011-02-08 18:17 ` Andrea Arcangeli 2011-02-03 21:54 ` David Rientjes 2011-02-03 21:54 ` David Rientjes
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