patch-2_6_7-vs1_9_1_12

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

diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index 378722d..bc55201 100644 (file)
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -852,7 +852,8 @@ this time.
 The value  in  file-max  denotes  the  maximum number of file handles that the
 Linux kernel will allocate. When you get a lot of error messages about running
 out of  file handles, you might want to raise this limit. The default value is
-4096. To change it, just write the new number into the file:
+10% of  RAM in kilobytes.  To  change it, just  write the new number  into the
+file:
 
   # cat /proc/sys/fs/file-max 
   4096 
@@ -864,11 +865,14 @@ out of  file handles, you might want to raise this limit. The default value is
 This method  of  revision  is  useful  for  all customizable parameters of the
 kernel - simply echo the new value to the corresponding file.
 
-The three  values  in file-nr denote the number of allocated file handles, the
-number of  used file handles, and the maximum number of file handles. When the
-allocated file  handles  come close to the maximum, but the number of actually
-used ones  is  far  behind,  you've  encountered  a peak in your usage of file
-handles and you don't need to increase the maximum.
+Historically, the three values in file-nr denoted the number of allocated file
+handles,  the number of  allocated but  unused file  handles, and  the maximum
+number of file handles. Linux 2.6 always  reports 0 as the number of free file
+handles -- this  is not an error,  it just means that the  number of allocated
+file handles exactly matches the number of used file handles.
+
+Attempts to  allocate more  file descriptors than  file-max are  reported with
+printk, look for "VFS: file-max limit <number> reached".
 
 inode-state and inode-nr
 ------------------------
@@ -1208,6 +1212,14 @@ On the  other  hand,  enabling this feature can cause you to run out of memory
 and thrash the system to death, so large and/or important servers will want to
 set this value to 0.
 
+nr_hugepages and hugetlb_shm_group
+----------------------------------
+
+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.
+
 2.5 /proc/sys/dev - Device specific parameters
 ----------------------------------------------
 
@@ -1848,10 +1860,3 @@ need to  recompile  the kernel, or even to reboot the system. The files in the
 command to write value into these files, thereby changing the default settings
 of the kernel.
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