From: Mauricio Lin Add a "smaps" entry to /proc/pid: show howmuch memory is resident in each mapping. People that want to perform a memory consumption analysing can use it mainly if someone needs to figure out which libraries can be reduced for embedded systems. So the new features are the physical size of shared and clean [or dirty]; private and clean [or dirty]. Take a look the example below: # cat /proc/4576/smaps 08048000-080dc000 r-xp /bin/bash Size: 592 KB Rss: 500 KB Shared_Clean: 500 KB Shared_Dirty: 0 KB Private_Clean: 0 KB Private_Dirty: 0 KB 080dc000-080e2000 rw-p /bin/bash Size: 24 KB Rss: 24 KB Shared_Clean: 0 KB Shared_Dirty: 0 KB Private_Clean: 0 KB Private_Dirty: 24 KB 080e2000-08116000 rw-p Size: 208 KB Rss: 208 KB Shared_Clean: 0 KB Shared_Dirty: 0 KB Private_Clean: 0 KB Private_Dirty: 208 KB b7e2b000-b7e34000 r-xp /lib/tls/libnss_files-2.3.2.so Size: 36 KB Rss: 12 KB Shared_Clean: 12 KB Shared_Dirty: 0 KB Private_Clean: 0 KB Private_Dirty: 0 KB ... Signed-off-by: Andrew Morton --- Documentation/filesystems/proc.txt | 1 fs/proc/base.c | 61 ++++++++++++ fs/proc/task_mmu.c | 179 +++++++++++++++++++++++++++++++++++++ 3 files changed, 241 insertions(+) diff -puN Documentation/filesystems/proc.txt~proc-pid-smaps Documentation/filesystems/proc.txt --- 25/Documentation/filesystems/proc.txt~proc-pid-smaps 2005-05-03 16:14:03.000000000 -0700 +++ 25-akpm/Documentation/filesystems/proc.txt 2005-05-03 16:14:03.000000000 -0700 @@ -133,6 +133,7 @@ Table 1-1: Process specific entries in / statm Process memory status information status Process status in human readable form wchan If CONFIG_KALLSYMS is set, a pre-decoded wchan + smaps Extension based on maps, presenting the rss size for each mapped file .............................................................................. For example, to get the status information of a process, all you have to do is diff -puN fs/proc/base.c~proc-pid-smaps fs/proc/base.c --- 25/fs/proc/base.c~proc-pid-smaps 2005-05-03 16:14:03.000000000 -0700 +++ 25-akpm/fs/proc/base.c 2005-05-03 16:14:03.000000000 -0700 @@ -11,6 +11,40 @@ * go into icache. We cache the reference to task_struct upon lookup too. * Eventually it should become a filesystem in its own. We don't use the * rest of procfs anymore. + * + * + * Changelog: + * 17-Jan-2005 + * Allan Bezerra + * Bruna Moreira + * Edjard Mota + * Ilias Biris + * Mauricio Lin + * + * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT + * + * A new process specific entry (smaps) included in /proc. It shows the + * size of rss for each memory area. The maps entry lacks information + * about physical memory size (rss) for each mapped file, i.e., + * rss information for executables and library files. + * This additional information is useful for any tools that need to know + * about physical memory consumption for a process specific library. + * + * Changelog: + * 21-Feb-2005 + * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT + * Pud inclusion in the page table walking. + * + * ChangeLog: + * 10-Mar-2005 + * 10LE Instituto Nokia de Tecnologia - INdT: + * A better way to walks through the page table as suggested by Hugh Dickins. + * + * Simo Piiroinen : + * Smaps information related to shared, private, clean and dirty pages. + * + * Paul Mundt : + * Overall revision about smaps. */ #include @@ -67,6 +101,7 @@ enum pid_directory_inos { PROC_TGID_MAPS, PROC_TGID_MOUNTS, PROC_TGID_WCHAN, + PROC_TGID_SMAPS, #ifdef CONFIG_SCHEDSTATS PROC_TGID_SCHEDSTAT, #endif @@ -104,6 +139,7 @@ enum pid_directory_inos { PROC_TID_MAPS, PROC_TID_MOUNTS, PROC_TID_WCHAN, + PROC_TID_SMAPS, #ifdef CONFIG_SCHEDSTATS PROC_TID_SCHEDSTAT, #endif @@ -152,6 +188,7 @@ static struct pid_entry tgid_base_stuff[ E(PROC_TGID_ROOT, "root", S_IFLNK|S_IRWXUGO), E(PROC_TGID_EXE, "exe", S_IFLNK|S_IRWXUGO), E(PROC_TGID_MOUNTS, "mounts", S_IFREG|S_IRUGO), + E(PROC_TGID_SMAPS, "smaps", S_IFREG|S_IRUGO), #ifdef CONFIG_SECURITY E(PROC_TGID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO), #endif @@ -188,6 +225,7 @@ static struct pid_entry tid_base_stuff[] E(PROC_TID_ROOT, "root", S_IFLNK|S_IRWXUGO), E(PROC_TID_EXE, "exe", S_IFLNK|S_IRWXUGO), E(PROC_TID_MOUNTS, "mounts", S_IFREG|S_IRUGO), + E(PROC_TID_SMAPS, "smaps", S_IFREG|S_IRUGO), #ifdef CONFIG_SECURITY E(PROC_TID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO), #endif @@ -515,6 +553,25 @@ static struct file_operations proc_maps_ .release = seq_release, }; +extern struct seq_operations proc_pid_smaps_op; +static int smaps_open(struct inode *inode, struct file *file) +{ + struct task_struct *task = proc_task(inode); + int ret = seq_open(file, &proc_pid_smaps_op); + if (!ret) { + struct seq_file *m = file->private_data; + m->private = task; + } + return ret; +} + +static struct file_operations proc_smaps_operations = { + .open = smaps_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + extern struct seq_operations mounts_op; static int mounts_open(struct inode *inode, struct file *file) { @@ -1537,6 +1594,10 @@ static struct dentry *proc_pident_lookup case PROC_TGID_MOUNTS: inode->i_fop = &proc_mounts_operations; break; + case PROC_TID_SMAPS: + case PROC_TGID_SMAPS: + inode->i_fop = &proc_smaps_operations; + break; #ifdef CONFIG_SECURITY case PROC_TID_ATTR: inode->i_nlink = 2; diff -puN fs/proc/task_mmu.c~proc-pid-smaps fs/proc/task_mmu.c --- 25/fs/proc/task_mmu.c~proc-pid-smaps 2005-05-03 16:14:03.000000000 -0700 +++ 25-akpm/fs/proc/task_mmu.c 2005-05-03 16:14:03.000000000 -0700 @@ -146,6 +146,178 @@ static int show_map(struct seq_file *m, return 0; } +struct mem_size_stats +{ + unsigned long resident; + unsigned long shared_clean; + unsigned long shared_dirty; + unsigned long private_clean; + unsigned long private_dirty; +}; + +static void smaps_pte_range(pmd_t *pmd, + unsigned long address, + unsigned long size, + struct mem_size_stats *mss) +{ + pte_t *ptep, pte; + unsigned long end; + unsigned long pfn; + struct page *page; + + if (pmd_none(*pmd)) + return; + if (unlikely(pmd_bad(*pmd))) { + pmd_ERROR(*pmd); + pmd_clear(pmd); + return; + } + ptep = pte_offset_map(pmd, address); + address &= ~PMD_MASK; + end = address + size; + if (end > PMD_SIZE) + end = PMD_SIZE; + do { + pte = *ptep; + address += PAGE_SIZE; + ptep++; + + if (pte_none(pte) || (!pte_present(pte))) + continue; + + mss->resident += PAGE_SIZE; + pfn = pte_pfn(pte); + if (pfn_valid(pfn)) { + page = pfn_to_page(pfn); + if (page_count(page) >= 2) { + if (pte_dirty(pte)) + mss->shared_dirty += PAGE_SIZE; + else + mss->shared_clean += PAGE_SIZE; + } + else { + if (pte_dirty(pte)) + mss->private_dirty += PAGE_SIZE; + else + mss->private_clean += PAGE_SIZE; + } + } + } while (address < end); + pte_unmap(pte); +} + +static void smaps_pmd_range(pud_t *pud, + unsigned long address, + unsigned long size, + struct mem_size_stats *mss) +{ + pmd_t *pmd; + unsigned long end; + + if (pud_none(*pud)) + return; + if (unlikely(pud_bad(*pud))) { + pud_ERROR(*pud); + pud_clear(pud); + return; + } + pmd = pmd_offset(pud, address); + address &= ~PUD_MASK; + end = address + size; + if (end > PUD_SIZE) + end = PUD_SIZE; + do { + smaps_pte_range(pmd, address, end - address, mss); + address = (address + PMD_SIZE) & PMD_MASK; + pmd++; + } while (address < end); +} + +static void smaps_pud_range(pgd_t *pgd, + unsigned long address, + unsigned long size, + struct mem_size_stats *mss) +{ + pud_t *pud; + unsigned long end; + + if (pgd_none(*pgd)) + return; + if (unlikely(pgd_bad(*pgd))) { + pgd_ERROR(*pgd); + pgd_clear(pgd); + return; + } + pud = pud_offset(pgd, address); + address &= ~PGDIR_MASK; + end = address + size; + if (end > PGDIR_SIZE) + end = PGDIR_SIZE; + do { + smaps_pmd_range(pud, address, end - address, mss); + address = (address + PUD_SIZE) & PUD_MASK; + pud++; + } while (address < end); +} + +static void smaps_pgd_range(pgd_t *pgd, + unsigned long start_address, + unsigned long end_address, + struct mem_size_stats *mss) +{ + do { + smaps_pud_range(pgd, start_address, end_address - start_address, mss); + start_address = (start_address + PGDIR_SIZE) & PGDIR_MASK; + pgd++; + } while (start_address < end_address); +} + +static int show_smap(struct seq_file *m, void *v) +{ + struct vm_area_struct *map = v; + struct file *file = map->vm_file; + int flags = map->vm_flags; + struct mm_struct *mm = map->vm_mm; + unsigned long vma_len = (map->vm_end - map->vm_start); + struct mem_size_stats mss; + + memset(&mss, 0, sizeof mss); + + if (mm) { + pgd_t *pgd; + spin_lock(&mm->page_table_lock); + pgd = pgd_offset(mm, map->vm_start); + smaps_pgd_range(pgd, map->vm_start, map->vm_end, &mss); + spin_unlock(&mm->page_table_lock); + } + + seq_printf(m, "%08lx-%08lx %c%c%c%c ", + map->vm_start, + map->vm_end, + flags & VM_READ ? 'r' : '-', + flags & VM_WRITE ? 'w' : '-', + flags & VM_EXEC ? 'x' : '-', + flags & VM_MAYSHARE ? 's' : 'p'); + + if (map->vm_file) + seq_path(m, file->f_vfsmnt, file->f_dentry, " \t\n\\"); + + seq_printf(m, "\n" + "Size: %8lu KB\n" + "Rss: %8lu KB\n" + "Shared_Clean: %8lu KB\n" + "Shared_Dirty: %8lu KB\n" + "Private_Clean: %8lu KB\n" + "Private_Dirty: %8lu KB\n", + vma_len >> 10, + mss.resident >> 10, + mss.shared_clean >> 10, + mss.shared_dirty >> 10, + mss.private_clean >> 10, + mss.private_dirty >> 10); + return 0; +} + static void *m_start(struct seq_file *m, loff_t *pos) { struct task_struct *task = m->private; @@ -233,3 +405,10 @@ struct seq_operations proc_pid_maps_op = .stop = m_stop, .show = show_map }; + +struct seq_operations proc_pid_smaps_op = { + .start = m_start, + .next = m_next, + .stop = m_stop, + .show = show_smap +}; _