vserver 1.9.3

[linux-2.6.git] / Documentation / filesystems / proc.txt

diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index bc55201..0dad0f2 100644 (file)
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -55,7 +55,7 @@ This work is  based on the 2.2.*  kernel version and the  upcoming 2.4.*. I'm
 afraid it's still far from complete, but we  hope it will be useful. As far as
 we know, it is the first 'all-in-one' document about the /proc file system. It
 is focused  on the Intel  x86 hardware,  so if you  are looking for  PPC, ARM,
 afraid it's still far from complete, but we  hope it will be useful. As far as
 we know, it is the first 'all-in-one' document about the /proc file system. It
 is focused  on the Intel  x86 hardware,  so if you  are looking for  PPC, ARM,

-SPARC, APX, etc., features, you probably  won't find what you are looking for.
+SPARC, AXP, etc., features, you probably  won't find what you are looking for.

 It also only covers IPv4 networking, not IPv6 nor other protocols - sorry. But
 additions and patches  are welcome and will  be added to this  document if you
 mail them to Bodo.
 It also only covers IPv4 networking, not IPv6 nor other protocols - sorry. But
 additions and patches  are welcome and will  be added to this  document if you
 mail them to Bodo.


@@ -169,16 +169,18 @@ information. The  statm  file  contains  more  detailed  information about the
 process memory usage. Its seven fields are explained in Table 1-2.
 
 
 process memory usage. Its seven fields are explained in Table 1-2.
 
 

-Table 1-2: Contents of the statm files 
+Table 1-2: Contents of the statm files (as of 2.6.8-rc3)

 ..............................................................................
 ..............................................................................

- File     Content                         
- size     total program size              
- resident size of memory portions         
- shared   number of pages that are shared 
- trs      number of pages that are 'code' 
- drs      number of pages of data/stack   
- lrs      number of pages of library      
- dt       number of dirty pages           
+ Field    Content
+ size     total program size (pages)           (same as VmSize in status)
+ resident size of memory portions (pages)      (same as VmRSS in status)
+ shared   number of pages that are shared      (i.e. backed by a file)
+ trs      number of pages that are 'code'      (not including libs; broken,
+                                                       includes data segment)
+ lrs      number of pages of library           (always 0 on 2.6)
+ drs      number of pages of data/stack                (including libs; broken,
+                                                       includes library text)
+ dt       number of dirty pages                        (always 0 on 2.6)

 ..............................................................................
 
 1.2 Kernel data
 ..............................................................................
 
 1.2 Kernel data


@@ -201,7 +203,7 @@ Table 1-3: Kernel info in /proc
  devices     Available devices (block and character)           
  dma         Used DMS channels                                 
  filesystems Supported filesystems                             
  devices     Available devices (block and character)           
  dma         Used DMS channels                                 
  filesystems Supported filesystems                             

- driver             Various drivers grouped here, currently rtc        (2.4)
+ driver             Various drivers grouped here, currently rtc (2.4)

  execdomains Execdomains, related to security                  (2.4)
  fb         Frame Buffer devices                               (2.4)
  fs         File system parameters, currently nfs/exports      (2.4)
  execdomains Execdomains, related to security                  (2.4)
  fb         Frame Buffer devices                               (2.4)
  fs         File system parameters, currently nfs/exports      (2.4)


@@ -1109,12 +1111,41 @@ modprobe
 The location  where  the  modprobe  binary  is  located.  The kernel uses this
 program to load modules on demand.
 
 The location  where  the  modprobe  binary  is  located.  The kernel uses this
 program to load modules on demand.
 

+unknown_nmi_panic
+-----------------
+
+The value in this file affects behavior of handling NMI. When the value is
+non-zero, unknown NMI is trapped and then panic occurs. At that time, kernel
+debugging information is displayed on console.
+
+NMI switch that most IA32 servers have fires unknown NMI up, for example.
+If a system hangs up, try pressing the NMI switch.
+
+[NOTE]
+   This function and oprofile share a NMI callback. Therefore this function
+   cannot be enabled when oprofile is activated.
+   And NMI watchdog will be disabled when the value in this file is set to
+   non-zero.
+
+

 2.4 /proc/sys/vm - The virtual memory subsystem
 -----------------------------------------------
 
 The files  in  this directory can be used to tune the operation of the virtual
 memory (VM)  subsystem  of  the  Linux  kernel.
 
 2.4 /proc/sys/vm - The virtual memory subsystem
 -----------------------------------------------
 
 The files  in  this directory can be used to tune the operation of the virtual
 memory (VM)  subsystem  of  the  Linux  kernel.
 

+vfs_cache_pressure
+------------------
+
+Controls the tendency of the kernel to reclaim the memory which is used for
+caching of directory and inode objects.
+
+At the default value of vfs_cache_pressure=100 the kernel will attempt to
+reclaim dentries and inodes at a "fair" rate with respect to pagecache and
+swapcache reclaim.  Decreasing vfs_cache_pressure causes the kernel to prefer
+to retain dentry and inode caches.  Increasing vfs_cache_pressure beyond 100
+causes the kernel to prefer to reclaim dentries and inodes.
+

 dirty_background_ratio
 ----------------------
 
 dirty_background_ratio
 ----------------------
 


@@ -1145,6 +1176,12 @@ for writeout by the pdflush daemons.  It is expressed in 100'ths of a second.
 Data which has been dirty in-memory for longer than this interval will be
 written out next time a pdflush daemon wakes up.
 
 Data which has been dirty in-memory for longer than this interval will be
 written out next time a pdflush daemon wakes up.
 

+legacy_va_layout
+----------------
+
+If non-zero, this sysctl disables the new 32-bit mmap mmap layout - the kernel
+will use the legacy (2.4) layout for all processes.
+

 lower_zone_protection
 ---------------------
 
 lower_zone_protection
 ---------------------
 


@@ -1220,6 +1257,18 @@ nr_hugepages configures number of hugetlb page reserved for the system.
 hugetlb_shm_group contains group id that is allowed to create SysV shared
 memory segment using hugetlb page.
 
 hugetlb_shm_group contains group id that is allowed to create SysV shared
 memory segment using hugetlb page.
 

+laptop_mode
+-----------
+
+laptop_mode is a knob that controls "laptop mode". All the things that are
+controlled by this knob are discussed in Documentation/laptop-mode.txt.
+
+block_dump
+----------
+
+block_dump enables block I/O debugging when set to a nonzero value. More
+information on block I/O debugging is in Documentation/laptop-mode.txt.
+

 2.5 /proc/sys/dev - Device specific parameters
 ----------------------------------------------
 
 2.5 /proc/sys/dev - Device specific parameters
 ----------------------------------------------
 


@@ -1640,7 +1689,8 @@ flush
 
 Writing to this file results in a flush of the routing cache.
 
 
 Writing to this file results in a flush of the routing cache.
 

-gc_elastic, gc_interval, gc_min_interval, gc_tresh, gc_timeout
+gc_elasticity, gc_interval, gc_min_interval, gc_tresh, gc_timeout,
+gc_thresh, gc_thresh1, gc_thresh2, gc_thresh3

 --------------------------------------------------------------
 
 Values to  control  the  frequency  and  behavior  of  the  garbage collection
 --------------------------------------------------------------
 
 Values to  control  the  frequency  and  behavior  of  the  garbage collection