Documentation/sysctl/kernel.txt: document /proc/sys/shmall

Signed-off-by: Carlos Alberto Lopez Perez <[email protected]> Cc: Rob Landley <[email protected]> Cc: Larry Finger <[email protected]> Cc: Neil Horman <[email protected]> Cc: Mitsuo Hayasaka <[email protected]> Cc: Tejun Heo <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
kishon · Jan 5, 2013 · 358e419 · 358e419
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diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
@@ -561,6 +561,19 @@ are doing anyway :)
 
 ==============================================================
 
+shmall:
+
+This parameter sets the total amount of shared memory pages that
+can be used system wide. Hence, SHMALL should always be at least
+ceil(shmmax/PAGE_SIZE).
+
+If you are not sure what the default PAGE_SIZE is on your Linux
+system, you can run the following command:
+
+# getconf PAGE_SIZE
+
+==============================================================
+
 shmmax:
 
 This value can be used to query and set the run time limit