1. 30 Mar, 2012 7 commits
  2. 29 Mar, 2012 2 commits
    • Dave Young's avatar
      mm: move hugepage test examples to tools/testing/selftests/vm · f0f57b2b
      Dave Young authored
      hugepage-mmap.c, hugepage-shm.c and map_hugetlb.c in Documentation/vm are
      simple pass/fail tests, It's better to promote them to
      tools/testing/selftests.
      
      Thanks suggestion of Andrew Morton about this.  They all need firstly
      setting up proper nr_hugepages and hugepage-mmap need to mount hugetlbfs.
      So I add a shell script run_vmtests to do such work which will call the
      three test programs and check the return value of them.
      
      Changes to original code including below:
      a. add run_vmtests script
      b. return error when read_bytes mismatch with writed bytes.
      c. coding style fixes: do not use assignment in if condition
      
      [akpm@linux-foundation.org: build the targets before trying to execute them]
      [akpm@linux-foundation.org: Documentation/vm/ no longer has a Makefile. Fixes "make clean"]
      Signed-off-by: default avatarDave Young <dyoung@redhat.com>
      Cc: Wu Fengguang <fengguang.wu@intel.com>
      Cc: Christoph Lameter <cl@linux.com>
      Cc: Pekka Enberg <penberg@cs.helsinki.fi>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      f0f57b2b
    • Dave Young's avatar
      mm: move page-types.c from Documentation to tools/vm · c6dd897f
      Dave Young authored
      tools/ is the better place for vm tools which are used by many people.
      Moving them to tools also make them open to more users instead of hide in
      Documentation folder.
      
      This patch moves page-types.c to tools/vm/page-types.c.  Also add a
      Makefile in tools/vm and fix two coding style problems: a) change const
      arrary to 'const char * const', b) change a space to tab for indent.
      Signed-off-by: default avatarDave Young <dyoung@redhat.com>
      Acked-by: default avatarWu Fengguang <fengguang.wu@intel.com>
      Cc: Christoph Lameter <cl@linux.com>
      Cc: Pekka Enberg <penberg@cs.helsinki.fi>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c6dd897f
  3. 28 Mar, 2012 7 commits
  4. 27 Mar, 2012 5 commits
  5. 26 Mar, 2012 5 commits
  6. 23 Mar, 2012 8 commits
  7. 22 Mar, 2012 6 commits
    • Sebastian Andrzej Siewior's avatar
      Documentation/kernel-parameters: remove inttest parameter · b86c4782
      Sebastian Andrzej Siewior authored
      According to grep I see no users:
      | #git grep inttest
      | Documentation/kernel-parameters.txt:    inttest=        [IA-64]
      
      The parameters itself has no description what it supposed to do.
      According to the history tree, it was introduced in "[PATCH] Updated
      Documentation/kernel-parameters.txt" ("10414c6ddb"). By that time that
      parameter had an user. It was removed later by "[PATCH] ia64: SGI SN
      update" ("c6bacd5010ec") by Jesse Barnes himself.
      
      Cc: Fenghua Yu <fenghua.yu@intel.com>
      Cc: Randy Dunlap <rdunlap@xenotime.net>
      Signed-off-by: default avatarSebastian Andrzej Siewior <sebastian@breakpoint.cc>
      Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
      b86c4782
    • Jason Wessel's avatar
      kgdb,debug_core: add the ability to control the reboot notifier · bec4d62e
      Jason Wessel authored
      Sometimes it is desirable to stop the kernel debugger before allowing
      a system to reboot either with kdb or kgdb.  This patch adds the
      ability to turn the reboot notifier on and off or enter the debugger
      and stop kernel execution before rebooting.
      
      It is possible to change the setting after booting the kernel with the
      following:
      
      echo 1 > /sys/module/debug_core/parameters/kgdbreboot
      
      It is also possible to change this setting using kdb / kgdb to
      manipulate the variable directly.
      
      Using KDB:
         mm kgdbreboot 1
      
      Using gdb:
         set kgdbreboot=1
      Reported-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
      Signed-off-by: default avatarJason Wessel <jason.wessel@windriver.com>
      bec4d62e
    • Benoit Cousson's avatar
      gpio/twl: Add DT support to gpio-twl4030 driver · b8589e2a
      Benoit Cousson authored
      Add the DT support for the I2C GPIO expander inside the twl4030.
      
      Note: The pdata parameters still have to be properly adapted using
      dedicated bindings.
      Signed-off-by: default avatarBenoit Cousson <b-cousson@ti.com>
      Acked-by: default avatarFelipe Balbi <balbi@ti.com>
      Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
      Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
      b8589e2a
    • Siddhesh Poyarekar's avatar
      procfs: mark thread stack correctly in proc/<pid>/maps · b7643757
      Siddhesh Poyarekar authored
      Stack for a new thread is mapped by userspace code and passed via
      sys_clone.  This memory is currently seen as anonymous in
      /proc/<pid>/maps, which makes it difficult to ascertain which mappings
      are being used for thread stacks.  This patch uses the individual task
      stack pointers to determine which vmas are actually thread stacks.
      
      For a multithreaded program like the following:
      
      	#include <pthread.h>
      
      	void *thread_main(void *foo)
      	{
      		while(1);
      	}
      
      	int main()
      	{
      		pthread_t t;
      		pthread_create(&t, NULL, thread_main, NULL);
      		pthread_join(t, NULL);
      	}
      
      proc/PID/maps looks like the following:
      
          00400000-00401000 r-xp 00000000 fd:0a 3671804                            /home/siddhesh/a.out
          00600000-00601000 rw-p 00000000 fd:0a 3671804                            /home/siddhesh/a.out
          019ef000-01a10000 rw-p 00000000 00:00 0                                  [heap]
          7f8a44491000-7f8a44492000 ---p 00000000 00:00 0
          7f8a44492000-7f8a44c92000 rw-p 00000000 00:00 0
          7f8a44c92000-7f8a44e3d000 r-xp 00000000 fd:00 2097482                    /lib64/libc-2.14.90.so
          7f8a44e3d000-7f8a4503d000 ---p 001ab000 fd:00 2097482                    /lib64/libc-2.14.90.so
          7f8a4503d000-7f8a45041000 r--p 001ab000 fd:00 2097482                    /lib64/libc-2.14.90.so
          7f8a45041000-7f8a45043000 rw-p 001af000 fd:00 2097482                    /lib64/libc-2.14.90.so
          7f8a45043000-7f8a45048000 rw-p 00000000 00:00 0
          7f8a45048000-7f8a4505f000 r-xp 00000000 fd:00 2099938                    /lib64/libpthread-2.14.90.so
          7f8a4505f000-7f8a4525e000 ---p 00017000 fd:00 2099938                    /lib64/libpthread-2.14.90.so
          7f8a4525e000-7f8a4525f000 r--p 00016000 fd:00 2099938                    /lib64/libpthread-2.14.90.so
          7f8a4525f000-7f8a45260000 rw-p 00017000 fd:00 2099938                    /lib64/libpthread-2.14.90.so
          7f8a45260000-7f8a45264000 rw-p 00000000 00:00 0
          7f8a45264000-7f8a45286000 r-xp 00000000 fd:00 2097348                    /lib64/ld-2.14.90.so
          7f8a45457000-7f8a4545a000 rw-p 00000000 00:00 0
          7f8a45484000-7f8a45485000 rw-p 00000000 00:00 0
          7f8a45485000-7f8a45486000 r--p 00021000 fd:00 2097348                    /lib64/ld-2.14.90.so
          7f8a45486000-7f8a45487000 rw-p 00022000 fd:00 2097348                    /lib64/ld-2.14.90.so
          7f8a45487000-7f8a45488000 rw-p 00000000 00:00 0
          7fff6273b000-7fff6275c000 rw-p 00000000 00:00 0                          [stack]
          7fff627ff000-7fff62800000 r-xp 00000000 00:00 0                          [vdso]
          ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]
      
      Here, one could guess that 7f8a44492000-7f8a44c92000 is a stack since
      the earlier vma that has no permissions (7f8a44e3d000-7f8a4503d000) but
      that is not always a reliable way to find out which vma is a thread
      stack.  Also, /proc/PID/maps and /proc/PID/task/TID/maps has the same
      content.
      
      With this patch in place, /proc/PID/task/TID/maps are treated as 'maps
      as the task would see it' and hence, only the vma that that task uses as
      stack is marked as [stack].  All other 'stack' vmas are marked as
      anonymous memory.  /proc/PID/maps acts as a thread group level view,
      where all thread stack vmas are marked as [stack:TID] where TID is the
      process ID of the task that uses that vma as stack, while the process
      stack is marked as [stack].
      
      So /proc/PID/maps will look like this:
      
          00400000-00401000 r-xp 00000000 fd:0a 3671804                            /home/siddhesh/a.out
          00600000-00601000 rw-p 00000000 fd:0a 3671804                            /home/siddhesh/a.out
          019ef000-01a10000 rw-p 00000000 00:00 0                                  [heap]
          7f8a44491000-7f8a44492000 ---p 00000000 00:00 0
          7f8a44492000-7f8a44c92000 rw-p 00000000 00:00 0                          [stack:1442]
          7f8a44c92000-7f8a44e3d000 r-xp 00000000 fd:00 2097482                    /lib64/libc-2.14.90.so
          7f8a44e3d000-7f8a4503d000 ---p 001ab000 fd:00 2097482                    /lib64/libc-2.14.90.so
          7f8a4503d000-7f8a45041000 r--p 001ab000 fd:00 2097482                    /lib64/libc-2.14.90.so
          7f8a45041000-7f8a45043000 rw-p 001af000 fd:00 2097482                    /lib64/libc-2.14.90.so
          7f8a45043000-7f8a45048000 rw-p 00000000 00:00 0
          7f8a45048000-7f8a4505f000 r-xp 00000000 fd:00 2099938                    /lib64/libpthread-2.14.90.so
          7f8a4505f000-7f8a4525e000 ---p 00017000 fd:00 2099938                    /lib64/libpthread-2.14.90.so
          7f8a4525e000-7f8a4525f000 r--p 00016000 fd:00 2099938                    /lib64/libpthread-2.14.90.so
          7f8a4525f000-7f8a45260000 rw-p 00017000 fd:00 2099938                    /lib64/libpthread-2.14.90.so
          7f8a45260000-7f8a45264000 rw-p 00000000 00:00 0
          7f8a45264000-7f8a45286000 r-xp 00000000 fd:00 2097348                    /lib64/ld-2.14.90.so
          7f8a45457000-7f8a4545a000 rw-p 00000000 00:00 0
          7f8a45484000-7f8a45485000 rw-p 00000000 00:00 0
          7f8a45485000-7f8a45486000 r--p 00021000 fd:00 2097348                    /lib64/ld-2.14.90.so
          7f8a45486000-7f8a45487000 rw-p 00022000 fd:00 2097348                    /lib64/ld-2.14.90.so
          7f8a45487000-7f8a45488000 rw-p 00000000 00:00 0
          7fff6273b000-7fff6275c000 rw-p 00000000 00:00 0                          [stack]
          7fff627ff000-7fff62800000 r-xp 00000000 00:00 0                          [vdso]
          ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]
      
      Thus marking all vmas that are used as stacks by the threads in the
      thread group along with the process stack.  The task level maps will
      however like this:
      
          00400000-00401000 r-xp 00000000 fd:0a 3671804                            /home/siddhesh/a.out
          00600000-00601000 rw-p 00000000 fd:0a 3671804                            /home/siddhesh/a.out
          019ef000-01a10000 rw-p 00000000 00:00 0                                  [heap]
          7f8a44491000-7f8a44492000 ---p 00000000 00:00 0
          7f8a44492000-7f8a44c92000 rw-p 00000000 00:00 0                          [stack]
          7f8a44c92000-7f8a44e3d000 r-xp 00000000 fd:00 2097482                    /lib64/libc-2.14.90.so
          7f8a44e3d000-7f8a4503d000 ---p 001ab000 fd:00 2097482                    /lib64/libc-2.14.90.so
          7f8a4503d000-7f8a45041000 r--p 001ab000 fd:00 2097482                    /lib64/libc-2.14.90.so
          7f8a45041000-7f8a45043000 rw-p 001af000 fd:00 2097482                    /lib64/libc-2.14.90.so
          7f8a45043000-7f8a45048000 rw-p 00000000 00:00 0
          7f8a45048000-7f8a4505f000 r-xp 00000000 fd:00 2099938                    /lib64/libpthread-2.14.90.so
          7f8a4505f000-7f8a4525e000 ---p 00017000 fd:00 2099938                    /lib64/libpthread-2.14.90.so
          7f8a4525e000-7f8a4525f000 r--p 00016000 fd:00 2099938                    /lib64/libpthread-2.14.90.so
          7f8a4525f000-7f8a45260000 rw-p 00017000 fd:00 2099938                    /lib64/libpthread-2.14.90.so
          7f8a45260000-7f8a45264000 rw-p 00000000 00:00 0
          7f8a45264000-7f8a45286000 r-xp 00000000 fd:00 2097348                    /lib64/ld-2.14.90.so
          7f8a45457000-7f8a4545a000 rw-p 00000000 00:00 0
          7f8a45484000-7f8a45485000 rw-p 00000000 00:00 0
          7f8a45485000-7f8a45486000 r--p 00021000 fd:00 2097348                    /lib64/ld-2.14.90.so
          7f8a45486000-7f8a45487000 rw-p 00022000 fd:00 2097348                    /lib64/ld-2.14.90.so
          7f8a45487000-7f8a45488000 rw-p 00000000 00:00 0
          7fff6273b000-7fff6275c000 rw-p 00000000 00:00 0
          7fff627ff000-7fff62800000 r-xp 00000000 00:00 0                          [vdso]
          ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]
      
      where only the vma that is being used as a stack by *that* task is
      marked as [stack].
      
      Analogous changes have been made to /proc/PID/smaps,
      /proc/PID/numa_maps, /proc/PID/task/TID/smaps and
      /proc/PID/task/TID/numa_maps. Relevant snippets from smaps and
      numa_maps:
      
          [siddhesh@localhost ~ ]$ pgrep a.out
          1441
          [siddhesh@localhost ~ ]$ cat /proc/1441/smaps | grep "\[stack"
          7f8a44492000-7f8a44c92000 rw-p 00000000 00:00 0                          [stack:1442]
          7fff6273b000-7fff6275c000 rw-p 00000000 00:00 0                          [stack]
          [siddhesh@localhost ~ ]$ cat /proc/1441/task/1442/smaps | grep "\[stack"
          7f8a44492000-7f8a44c92000 rw-p 00000000 00:00 0                          [stack]
          [siddhesh@localhost ~ ]$ cat /proc/1441/task/1441/smaps | grep "\[stack"
          7fff6273b000-7fff6275c000 rw-p 00000000 00:00 0                          [stack]
          [siddhesh@localhost ~ ]$ cat /proc/1441/numa_maps | grep "stack"
          7f8a44492000 default stack:1442 anon=2 dirty=2 N0=2
          7fff6273a000 default stack anon=3 dirty=3 N0=3
          [siddhesh@localhost ~ ]$ cat /proc/1441/task/1442/numa_maps | grep "stack"
          7f8a44492000 default stack anon=2 dirty=2 N0=2
          [siddhesh@localhost ~ ]$ cat /proc/1441/task/1441/numa_maps | grep "stack"
          7fff6273a000 default stack anon=3 dirty=3 N0=3
      
      [akpm@linux-foundation.org: checkpatch fixes]
      [akpm@linux-foundation.org: fix build]
      Signed-off-by: default avatarSiddhesh Poyarekar <siddhesh.poyarekar@gmail.com>
      Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
      Cc: Alexander Viro <viro@zeniv.linux.org.uk>
      Cc: Jamie Lokier <jamie@shareable.org>
      Cc: Mike Frysinger <vapier@gentoo.org>
      Cc: Alexey Dobriyan <adobriyan@gmail.com>
      Cc: Matt Mackall <mpm@selenic.com>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b7643757
    • Jiri Kosina's avatar
      thp: documentation: 'transparent_hugepage=' can also be specified on cmdline · fcf4d821
      Jiri Kosina authored
      The behavior of THP can either be toggled through sysfs in runtime or
      using a kernel cmdline parameter 'transparent_hugepage='.  Document the
      latter in kernel-parameters.txt
      Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: Mel Gorman <mel@csn.ul.ie>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      fcf4d821
    • Naoya Horiguchi's avatar
      pagemap: document KPF_THP and make page-types aware of it · 807f0ccf
      Naoya Horiguchi authored
      page-types, which is a common user of pagemap, gets aware of thp with this
      patch.  This helps system admins and kernel hackers know about how thp
      works.  Here is a sample output of page-types over a thp:
      
        $ page-types -p <pid> --raw --list
      
        voffset offset  len     flags
        ...
        7f9d40200       3f8400  1       ___U_lA____Ma_bH______t____________
        7f9d40201       3f8401  1ff     ________________T_____t____________
      
                     flags      page-count       MB  symbolic-flags                     long-symbolic-flags
        0x0000000000410000             511        1  ________________T_____t____________        compound_tail,thp
        0x000000000040d868               1        0  ___U_lA____Ma_bH______t____________        uptodate,lru,active,mmap,anonymous,swapbacked,compound_head,thp
      Signed-off-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
      Acked-by: default avatarWu Fengguang <fengguang.wu@intel.com>
      Reviewed-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
      Acked-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      807f0ccf