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authorHeinrich Schuchardt <xypron.glpk@gmx.de>2015-04-16 12:47:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-17 09:04:07 -0400
commit0ec62afeb143a34ce78143cf442f879ef68382f7 (patch)
tree20e5c2f675840a67cb3e70e514931a13e1bbe89a
parent16db3d3f1170fb0efca652c9378ce7c5f5cb4232 (diff)
Doc/sysctl/kernel.txt: document threads-max
File /proc/sys/kernel/threads-max controls the maximum number of threads that can be created using fork(). [akpm@linux-foundation.org: fix typo, per Guenter] Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--Documentation/sysctl/kernel.txt21
1 files changed, 21 insertions, 0 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 99d7eb3a1416..c831001c45f1 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -872,6 +872,27 @@ can be ORed together:
==============================================================
+threads-max
+
+This value controls the maximum number of threads that can be created
+using fork().
+
+During initialization the kernel sets this value such that even if the
+maximum number of threads is created, the thread structures occupy only
+a part (1/8th) of the available RAM pages.
+
+The minimum value that can be written to threads-max is 20.
+The maximum value that can be written to threads-max is given by the
+constant FUTEX_TID_MASK (0x3fffffff).
+If a value outside of this range is written to threads-max an error
+EINVAL occurs.
+
+The value written is checked against the available RAM pages. If the
+thread structures would occupy too much (more than 1/8th) of the
+available RAM pages threads-max is reduced accordingly.
+
+==============================================================
+
unknown_nmi_panic:
The value in this file affects behavior of handling NMI. When the