X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=Documentation%2Ffilesystems%2Fproc.txt;h=99902ae6804e6edb0550fac53ce34b9070842895;hb=4446065a2c9b65398ceb115f4d8c256eb1bb9647;hp=d4773565ea2f20fabf868505f8b48f2ea7b6295a;hpb=c85b2a5fe200d744a814d23c258460d4fc98a546;p=linux-2.6

diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index d4773565ea..99902ae680 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -121,7 +121,7 @@ Table 1-1: Process specific entries in /proc
 ..............................................................................
  File    Content                                        
  cmdline Command line arguments                         
- cpu	 Current and last cpu in wich it was executed		(2.4)(smp)
+ cpu	 Current and last cpu in which it was executed		(2.4)(smp)
  cwd	 Link to the current working directory
  environ Values of environment variables      
  exe	 Link to the executable of this process
@@ -309,13 +309,13 @@ is the same by default:
   > cat /proc/irq/0/smp_affinity 
   ffffffff
 
-It's a bitmask, in wich you can specify wich CPUs can handle the IRQ, you can
+It's a bitmask, in which you can specify which CPUs can handle the IRQ, you can
 set it by doing:
 
   > echo 1 > /proc/irq/prof_cpu_mask
 
 This means that only the first CPU will handle the IRQ, but you can also echo 5
-wich means that only the first and fourth CPU can handle the IRQ.
+which means that only the first and fourth CPU can handle the IRQ.
 
 The way IRQs are routed is handled by the IO-APIC, and it's Round Robin
 between all the CPUs which are allowed to handle it. As usual the kernel has
@@ -418,7 +418,7 @@ VmallocChunk:   111088 kB
        Dirty: Memory which is waiting to get written back to the disk
    Writeback: Memory which is actively being written back to the disk
       Mapped: files which have been mmaped, such as libraries
-              Slab: in-kernel data structures cache
+        Slab: in-kernel data structures cache
  CommitLimit: Based on the overcommit ratio ('vm.overcommit_ratio'),
               this is the total amount of  memory currently available to
               be allocated on the system. This limit is only adhered to
@@ -1302,6 +1302,23 @@ VM has token based thrashing control mechanism and uses the token to prevent
 unnecessary page faults in thrashing situation. The unit of the value is
 second. The value would be useful to tune thrashing behavior.
 
+drop_caches
+-----------
+
+Writing to this will cause the kernel to drop clean caches, dentries and
+inodes from memory, causing that memory to become free.
+
+To free pagecache:
+	echo 1 > /proc/sys/vm/drop_caches
+To free dentries and inodes:
+	echo 2 > /proc/sys/vm/drop_caches
+To free pagecache, dentries and inodes:
+	echo 3 > /proc/sys/vm/drop_caches
+
+As this is a non-destructive operation and dirty objects are not freeable, the
+user should run `sync' first.
+
+
 2.5 /proc/sys/dev - Device specific parameters
 ----------------------------------------------