![Matt Mackall](/assets/img/avatar_default.png)
configurable replacement for slab allocator This adds a CONFIG_SLAB option under CONFIG_EMBEDDED. When CONFIG_SLAB is disabled, the kernel falls back to using the 'SLOB' allocator. SLOB is a traditional K&R/UNIX allocator with a SLAB emulation layer, similar to the original Linux kmalloc allocator that SLAB replaced. It's signicantly smaller code and is more memory efficient. But like all similar allocators, it scales poorly and suffers from fragmentation more than SLAB, so it's only appropriate for small systems. It's been tested extensively in the Linux-tiny tree. I've also stress-tested it with make -j 8 compiles on a 3G SMP+PREEMPT box (not recommended). Here's a comparison for otherwise identical builds, showing SLOB saving nearly half a megabyte of RAM: $ size vmlinux* text data bss dec hex filename 3336372 529360 190812 4056544 3de5e0 vmlinux-slab 3323208 527948 190684 4041840 3dac70 vmlinux-slob $ size mm/{slab,slob}.o text data bss dec hex filename 13221 752 48 14021 36c5 mm/slab.o 1896 52 8 1956 7a4 mm/slob.o /proc/meminfo: SLAB SLOB delta MemTotal: 27964 kB 27980 kB +16 kB MemFree: 24596 kB 25092 kB +496 kB Buffers: 36 kB 36 kB 0 kB Cached: 1188 kB 1188 kB 0 kB SwapCached: 0 kB 0 kB 0 kB Active: 608 kB 600 kB -8 kB Inactive: 808 kB 812 kB +4 kB HighTotal: 0 kB 0 kB 0 kB HighFree: 0 kB 0 kB 0 kB LowTotal: 27964 kB 27980 kB +16 kB LowFree: 24596 kB 25092 kB +496 kB SwapTotal: 0 kB 0 kB 0 kB SwapFree: 0 kB 0 kB 0 kB Dirty: 4 kB 12 kB +8 kB Writeback: 0 kB 0 kB 0 kB Mapped: 560 kB 556 kB -4 kB Slab: 1756 kB 0 kB -1756 kB CommitLimit: 13980 kB 13988 kB +8 kB Committed_AS: 4208 kB 4208 kB 0 kB PageTables: 28 kB 28 kB 0 kB VmallocTotal: 1007312 kB 1007312 kB 0 kB VmallocUsed: 48 kB 48 kB 0 kB VmallocChunk: 1007264 kB 1007264 kB 0 kB (this work has been sponsored in part by CELF) From: Ingo Molnar <mingo@elte.hu> Fix 32-bitness bugs in mm/slob.c. Signed-off-by: Matt Mackall <mpm@selenic.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
637 lines
17 KiB
C
637 lines
17 KiB
C
/*
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* linux/fs/proc/proc_misc.c
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*
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* linux/fs/proc/array.c
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* Copyright (C) 1992 by Linus Torvalds
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* based on ideas by Darren Senn
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*
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* This used to be the part of array.c. See the rest of history and credits
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* there. I took this into a separate file and switched the thing to generic
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* proc_file_inode_operations, leaving in array.c only per-process stuff.
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* Inumbers allocation made dynamic (via create_proc_entry()). AV, May 1999.
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*
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* Changes:
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* Fulton Green : Encapsulated position metric calculations.
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* <kernel@FultonGreen.com>
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <linux/kernel.h>
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#include <linux/kernel_stat.h>
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#include <linux/tty.h>
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#include <linux/string.h>
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#include <linux/mman.h>
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#include <linux/proc_fs.h>
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#include <linux/ioport.h>
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#include <linux/config.h>
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#include <linux/mm.h>
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#include <linux/mmzone.h>
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#include <linux/pagemap.h>
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#include <linux/swap.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include <linux/signal.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/smp_lock.h>
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#include <linux/seq_file.h>
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#include <linux/times.h>
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#include <linux/profile.h>
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#include <linux/blkdev.h>
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#include <linux/hugetlb.h>
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#include <linux/jiffies.h>
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#include <linux/sysrq.h>
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#include <linux/vmalloc.h>
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#include <linux/crash_dump.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/io.h>
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#include <asm/tlb.h>
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#include <asm/div64.h>
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#include "internal.h"
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#define LOAD_INT(x) ((x) >> FSHIFT)
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#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
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/*
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* Warning: stuff below (imported functions) assumes that its output will fit
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* into one page. For some of those functions it may be wrong. Moreover, we
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* have a way to deal with that gracefully. Right now I used straightforward
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* wrappers, but this needs further analysis wrt potential overflows.
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*/
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extern int get_hardware_list(char *);
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extern int get_stram_list(char *);
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extern int get_chrdev_list(char *);
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extern int get_filesystem_list(char *);
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extern int get_exec_domain_list(char *);
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extern int get_dma_list(char *);
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extern int get_locks_status (char *, char **, off_t, int);
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static int proc_calc_metrics(char *page, char **start, off_t off,
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int count, int *eof, int len)
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{
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if (len <= off+count) *eof = 1;
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*start = page + off;
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len -= off;
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if (len>count) len = count;
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if (len<0) len = 0;
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return len;
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}
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static int loadavg_read_proc(char *page, char **start, off_t off,
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int count, int *eof, void *data)
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{
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int a, b, c;
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int len;
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a = avenrun[0] + (FIXED_1/200);
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b = avenrun[1] + (FIXED_1/200);
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c = avenrun[2] + (FIXED_1/200);
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len = sprintf(page,"%d.%02d %d.%02d %d.%02d %ld/%d %d\n",
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LOAD_INT(a), LOAD_FRAC(a),
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LOAD_INT(b), LOAD_FRAC(b),
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LOAD_INT(c), LOAD_FRAC(c),
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nr_running(), nr_threads, last_pid);
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return proc_calc_metrics(page, start, off, count, eof, len);
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}
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static int uptime_read_proc(char *page, char **start, off_t off,
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int count, int *eof, void *data)
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{
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struct timespec uptime;
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struct timespec idle;
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int len;
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cputime_t idletime = cputime_add(init_task.utime, init_task.stime);
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do_posix_clock_monotonic_gettime(&uptime);
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cputime_to_timespec(idletime, &idle);
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len = sprintf(page,"%lu.%02lu %lu.%02lu\n",
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(unsigned long) uptime.tv_sec,
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(uptime.tv_nsec / (NSEC_PER_SEC / 100)),
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(unsigned long) idle.tv_sec,
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(idle.tv_nsec / (NSEC_PER_SEC / 100)));
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return proc_calc_metrics(page, start, off, count, eof, len);
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}
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static int meminfo_read_proc(char *page, char **start, off_t off,
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int count, int *eof, void *data)
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{
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struct sysinfo i;
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int len;
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struct page_state ps;
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unsigned long inactive;
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unsigned long active;
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unsigned long free;
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unsigned long committed;
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unsigned long allowed;
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struct vmalloc_info vmi;
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long cached;
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get_page_state(&ps);
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get_zone_counts(&active, &inactive, &free);
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/*
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* display in kilobytes.
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*/
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#define K(x) ((x) << (PAGE_SHIFT - 10))
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si_meminfo(&i);
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si_swapinfo(&i);
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committed = atomic_read(&vm_committed_space);
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allowed = ((totalram_pages - hugetlb_total_pages())
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* sysctl_overcommit_ratio / 100) + total_swap_pages;
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cached = get_page_cache_size() - total_swapcache_pages - i.bufferram;
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if (cached < 0)
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cached = 0;
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get_vmalloc_info(&vmi);
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/*
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* Tagged format, for easy grepping and expansion.
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*/
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len = sprintf(page,
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"MemTotal: %8lu kB\n"
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"MemFree: %8lu kB\n"
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"Buffers: %8lu kB\n"
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"Cached: %8lu kB\n"
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"SwapCached: %8lu kB\n"
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"Active: %8lu kB\n"
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"Inactive: %8lu kB\n"
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"HighTotal: %8lu kB\n"
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"HighFree: %8lu kB\n"
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"LowTotal: %8lu kB\n"
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"LowFree: %8lu kB\n"
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"SwapTotal: %8lu kB\n"
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"SwapFree: %8lu kB\n"
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"Dirty: %8lu kB\n"
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"Writeback: %8lu kB\n"
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"Mapped: %8lu kB\n"
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"Slab: %8lu kB\n"
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"CommitLimit: %8lu kB\n"
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"Committed_AS: %8lu kB\n"
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"PageTables: %8lu kB\n"
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"VmallocTotal: %8lu kB\n"
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"VmallocUsed: %8lu kB\n"
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"VmallocChunk: %8lu kB\n",
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K(i.totalram),
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K(i.freeram),
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K(i.bufferram),
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K(cached),
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K(total_swapcache_pages),
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K(active),
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K(inactive),
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K(i.totalhigh),
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K(i.freehigh),
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K(i.totalram-i.totalhigh),
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K(i.freeram-i.freehigh),
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K(i.totalswap),
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K(i.freeswap),
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K(ps.nr_dirty),
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K(ps.nr_writeback),
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K(ps.nr_mapped),
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K(ps.nr_slab),
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K(allowed),
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K(committed),
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K(ps.nr_page_table_pages),
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(unsigned long)VMALLOC_TOTAL >> 10,
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vmi.used >> 10,
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vmi.largest_chunk >> 10
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);
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len += hugetlb_report_meminfo(page + len);
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return proc_calc_metrics(page, start, off, count, eof, len);
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#undef K
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}
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extern struct seq_operations fragmentation_op;
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static int fragmentation_open(struct inode *inode, struct file *file)
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{
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(void)inode;
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return seq_open(file, &fragmentation_op);
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}
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static struct file_operations fragmentation_file_operations = {
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.open = fragmentation_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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extern struct seq_operations zoneinfo_op;
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static int zoneinfo_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &zoneinfo_op);
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}
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static struct file_operations proc_zoneinfo_file_operations = {
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.open = zoneinfo_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static int version_read_proc(char *page, char **start, off_t off,
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int count, int *eof, void *data)
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{
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int len;
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strcpy(page, linux_banner);
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len = strlen(page);
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return proc_calc_metrics(page, start, off, count, eof, len);
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}
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extern struct seq_operations cpuinfo_op;
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static int cpuinfo_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &cpuinfo_op);
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}
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static struct file_operations proc_cpuinfo_operations = {
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.open = cpuinfo_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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extern struct seq_operations vmstat_op;
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static int vmstat_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &vmstat_op);
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}
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static struct file_operations proc_vmstat_file_operations = {
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.open = vmstat_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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#ifdef CONFIG_PROC_HARDWARE
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static int hardware_read_proc(char *page, char **start, off_t off,
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int count, int *eof, void *data)
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{
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int len = get_hardware_list(page);
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return proc_calc_metrics(page, start, off, count, eof, len);
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}
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#endif
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#ifdef CONFIG_STRAM_PROC
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static int stram_read_proc(char *page, char **start, off_t off,
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int count, int *eof, void *data)
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{
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int len = get_stram_list(page);
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return proc_calc_metrics(page, start, off, count, eof, len);
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}
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#endif
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extern struct seq_operations partitions_op;
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static int partitions_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &partitions_op);
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}
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static struct file_operations proc_partitions_operations = {
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.open = partitions_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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extern struct seq_operations diskstats_op;
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static int diskstats_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &diskstats_op);
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}
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static struct file_operations proc_diskstats_operations = {
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.open = diskstats_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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#ifdef CONFIG_MODULES
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extern struct seq_operations modules_op;
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static int modules_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &modules_op);
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}
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static struct file_operations proc_modules_operations = {
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.open = modules_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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#endif
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#ifdef CONFIG_SLAB
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extern struct seq_operations slabinfo_op;
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extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
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static int slabinfo_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &slabinfo_op);
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}
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static struct file_operations proc_slabinfo_operations = {
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.open = slabinfo_open,
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.read = seq_read,
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.write = slabinfo_write,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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#endif
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static int show_stat(struct seq_file *p, void *v)
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{
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int i;
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unsigned long jif;
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cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
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u64 sum = 0;
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user = nice = system = idle = iowait =
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irq = softirq = steal = cputime64_zero;
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jif = - wall_to_monotonic.tv_sec;
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if (wall_to_monotonic.tv_nsec)
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--jif;
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for_each_cpu(i) {
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int j;
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user = cputime64_add(user, kstat_cpu(i).cpustat.user);
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nice = cputime64_add(nice, kstat_cpu(i).cpustat.nice);
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system = cputime64_add(system, kstat_cpu(i).cpustat.system);
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idle = cputime64_add(idle, kstat_cpu(i).cpustat.idle);
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iowait = cputime64_add(iowait, kstat_cpu(i).cpustat.iowait);
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irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
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softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
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steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
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for (j = 0 ; j < NR_IRQS ; j++)
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sum += kstat_cpu(i).irqs[j];
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}
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seq_printf(p, "cpu %llu %llu %llu %llu %llu %llu %llu %llu\n",
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(unsigned long long)cputime64_to_clock_t(user),
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(unsigned long long)cputime64_to_clock_t(nice),
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(unsigned long long)cputime64_to_clock_t(system),
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(unsigned long long)cputime64_to_clock_t(idle),
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(unsigned long long)cputime64_to_clock_t(iowait),
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(unsigned long long)cputime64_to_clock_t(irq),
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(unsigned long long)cputime64_to_clock_t(softirq),
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(unsigned long long)cputime64_to_clock_t(steal));
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for_each_online_cpu(i) {
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/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
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user = kstat_cpu(i).cpustat.user;
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nice = kstat_cpu(i).cpustat.nice;
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system = kstat_cpu(i).cpustat.system;
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idle = kstat_cpu(i).cpustat.idle;
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iowait = kstat_cpu(i).cpustat.iowait;
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irq = kstat_cpu(i).cpustat.irq;
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softirq = kstat_cpu(i).cpustat.softirq;
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steal = kstat_cpu(i).cpustat.steal;
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seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu\n",
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i,
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(unsigned long long)cputime64_to_clock_t(user),
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(unsigned long long)cputime64_to_clock_t(nice),
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(unsigned long long)cputime64_to_clock_t(system),
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(unsigned long long)cputime64_to_clock_t(idle),
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(unsigned long long)cputime64_to_clock_t(iowait),
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(unsigned long long)cputime64_to_clock_t(irq),
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(unsigned long long)cputime64_to_clock_t(softirq),
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(unsigned long long)cputime64_to_clock_t(steal));
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}
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seq_printf(p, "intr %llu", (unsigned long long)sum);
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#if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA)
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for (i = 0; i < NR_IRQS; i++)
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seq_printf(p, " %u", kstat_irqs(i));
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#endif
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seq_printf(p,
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"\nctxt %llu\n"
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"btime %lu\n"
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"processes %lu\n"
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"procs_running %lu\n"
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"procs_blocked %lu\n",
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nr_context_switches(),
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(unsigned long)jif,
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total_forks,
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nr_running(),
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nr_iowait());
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return 0;
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}
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static int stat_open(struct inode *inode, struct file *file)
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{
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unsigned size = 4096 * (1 + num_possible_cpus() / 32);
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char *buf;
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struct seq_file *m;
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int res;
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/* don't ask for more than the kmalloc() max size, currently 128 KB */
|
|
if (size > 128 * 1024)
|
|
size = 128 * 1024;
|
|
buf = kmalloc(size, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
res = single_open(file, show_stat, NULL);
|
|
if (!res) {
|
|
m = file->private_data;
|
|
m->buf = buf;
|
|
m->size = size;
|
|
} else
|
|
kfree(buf);
|
|
return res;
|
|
}
|
|
static struct file_operations proc_stat_operations = {
|
|
.open = stat_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int devices_read_proc(char *page, char **start, off_t off,
|
|
int count, int *eof, void *data)
|
|
{
|
|
int len = get_chrdev_list(page);
|
|
len += get_blkdev_list(page+len, len);
|
|
return proc_calc_metrics(page, start, off, count, eof, len);
|
|
}
|
|
|
|
/*
|
|
* /proc/interrupts
|
|
*/
|
|
static void *int_seq_start(struct seq_file *f, loff_t *pos)
|
|
{
|
|
return (*pos <= NR_IRQS) ? pos : NULL;
|
|
}
|
|
|
|
static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
|
|
{
|
|
(*pos)++;
|
|
if (*pos > NR_IRQS)
|
|
return NULL;
|
|
return pos;
|
|
}
|
|
|
|
static void int_seq_stop(struct seq_file *f, void *v)
|
|
{
|
|
/* Nothing to do */
|
|
}
|
|
|
|
|
|
extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
|
|
static struct seq_operations int_seq_ops = {
|
|
.start = int_seq_start,
|
|
.next = int_seq_next,
|
|
.stop = int_seq_stop,
|
|
.show = show_interrupts
|
|
};
|
|
|
|
static int interrupts_open(struct inode *inode, struct file *filp)
|
|
{
|
|
return seq_open(filp, &int_seq_ops);
|
|
}
|
|
|
|
static struct file_operations proc_interrupts_operations = {
|
|
.open = interrupts_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
static int filesystems_read_proc(char *page, char **start, off_t off,
|
|
int count, int *eof, void *data)
|
|
{
|
|
int len = get_filesystem_list(page);
|
|
return proc_calc_metrics(page, start, off, count, eof, len);
|
|
}
|
|
|
|
static int cmdline_read_proc(char *page, char **start, off_t off,
|
|
int count, int *eof, void *data)
|
|
{
|
|
int len;
|
|
|
|
len = sprintf(page, "%s\n", saved_command_line);
|
|
return proc_calc_metrics(page, start, off, count, eof, len);
|
|
}
|
|
|
|
static int locks_read_proc(char *page, char **start, off_t off,
|
|
int count, int *eof, void *data)
|
|
{
|
|
int len = get_locks_status(page, start, off, count);
|
|
|
|
if (len < count)
|
|
*eof = 1;
|
|
return len;
|
|
}
|
|
|
|
static int execdomains_read_proc(char *page, char **start, off_t off,
|
|
int count, int *eof, void *data)
|
|
{
|
|
int len = get_exec_domain_list(page);
|
|
return proc_calc_metrics(page, start, off, count, eof, len);
|
|
}
|
|
|
|
#ifdef CONFIG_MAGIC_SYSRQ
|
|
/*
|
|
* writing 'C' to /proc/sysrq-trigger is like sysrq-C
|
|
*/
|
|
static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
if (count) {
|
|
char c;
|
|
|
|
if (get_user(c, buf))
|
|
return -EFAULT;
|
|
__handle_sysrq(c, NULL, NULL, 0);
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static struct file_operations proc_sysrq_trigger_operations = {
|
|
.write = write_sysrq_trigger,
|
|
};
|
|
#endif
|
|
|
|
struct proc_dir_entry *proc_root_kcore;
|
|
|
|
void create_seq_entry(char *name, mode_t mode, struct file_operations *f)
|
|
{
|
|
struct proc_dir_entry *entry;
|
|
entry = create_proc_entry(name, mode, NULL);
|
|
if (entry)
|
|
entry->proc_fops = f;
|
|
}
|
|
|
|
void __init proc_misc_init(void)
|
|
{
|
|
struct proc_dir_entry *entry;
|
|
static struct {
|
|
char *name;
|
|
int (*read_proc)(char*,char**,off_t,int,int*,void*);
|
|
} *p, simple_ones[] = {
|
|
{"loadavg", loadavg_read_proc},
|
|
{"uptime", uptime_read_proc},
|
|
{"meminfo", meminfo_read_proc},
|
|
{"version", version_read_proc},
|
|
#ifdef CONFIG_PROC_HARDWARE
|
|
{"hardware", hardware_read_proc},
|
|
#endif
|
|
#ifdef CONFIG_STRAM_PROC
|
|
{"stram", stram_read_proc},
|
|
#endif
|
|
{"devices", devices_read_proc},
|
|
{"filesystems", filesystems_read_proc},
|
|
{"cmdline", cmdline_read_proc},
|
|
{"locks", locks_read_proc},
|
|
{"execdomains", execdomains_read_proc},
|
|
{NULL,}
|
|
};
|
|
for (p = simple_ones; p->name; p++)
|
|
create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);
|
|
|
|
proc_symlink("mounts", NULL, "self/mounts");
|
|
|
|
/* And now for trickier ones */
|
|
entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
|
|
if (entry)
|
|
entry->proc_fops = &proc_kmsg_operations;
|
|
create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
|
|
create_seq_entry("partitions", 0, &proc_partitions_operations);
|
|
create_seq_entry("stat", 0, &proc_stat_operations);
|
|
create_seq_entry("interrupts", 0, &proc_interrupts_operations);
|
|
#ifdef CONFIG_SLAB
|
|
create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
|
|
#endif
|
|
create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
|
|
create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
|
|
create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
|
|
create_seq_entry("diskstats", 0, &proc_diskstats_operations);
|
|
#ifdef CONFIG_MODULES
|
|
create_seq_entry("modules", 0, &proc_modules_operations);
|
|
#endif
|
|
#ifdef CONFIG_SCHEDSTATS
|
|
create_seq_entry("schedstat", 0, &proc_schedstat_operations);
|
|
#endif
|
|
#ifdef CONFIG_PROC_KCORE
|
|
proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
|
|
if (proc_root_kcore) {
|
|
proc_root_kcore->proc_fops = &proc_kcore_operations;
|
|
proc_root_kcore->size =
|
|
(size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_PROC_VMCORE
|
|
proc_vmcore = create_proc_entry("vmcore", S_IRUSR, NULL);
|
|
if (proc_vmcore)
|
|
proc_vmcore->proc_fops = &proc_vmcore_operations;
|
|
#endif
|
|
#ifdef CONFIG_MAGIC_SYSRQ
|
|
entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
|
|
if (entry)
|
|
entry->proc_fops = &proc_sysrq_trigger_operations;
|
|
#endif
|
|
}
|