Allow LPM self-tests to complete even if no CPU affinity

src/lib/lpm/ip4.lua

@@ -119,13 +119,20 @@ function IP4.selftest ()
    selftest_get_bit()
    selftest_commonlength()
    local pmu = require("lib.pmu")
-   local gbit = IP4.get_bit
-   pmu.profile(function()
-      local c = 0
-      for i = 0,1000000 do
-         c = c + IP4.commonlength(i,i)
-      end
-   end)
+   local avail, err = pmu.is_available()
+   if not avail then
+      print("PMU not available:")
+      print("  "..err)
+      print("Skipping benchmark.")
+   else
+      local gbit = IP4.get_bit
+      pmu.profile(function()
+         local c = 0
+         for i = 0,1000000 do
+            c = c + IP4.commonlength(i,i)
+         end
+      end)
+   end
 end
 
 return IP4

src/lib/lpm/lpm4.lua

@@ -259,6 +259,13 @@ function LPM4:selftest (cfg, millions)
    g:verify(f)
    C.free(ptr)
 
-   self:new(cfg):add_random_entries():benchmark(millions)
+   local avail, err = require('lib.pmu').is_available()
+   if not avail then
+      print("PMU not available:")
+      print("  "..err)
+      print("Skipping benchmark.")
+   else
+      self:new(cfg):add_random_entries():benchmark(millions)
+   end
    print("selftest complete")
 end

src/lib/lpm/lpm4_poptrie.lua

@@ -164,10 +164,17 @@ function selftest_get_bits ()
    assert(g(p("0.3.128.0"),14) == 56)
    assert(g(p("192.0.0.0"),0) == 48)
    local pmu = require("lib.pmu")
-   local n = 0
-   pmu.profile(function()
-      for i =0, 1000*1000*1000 do n = n + g(i, 7) end
-   end)
+   local avail, err = pmu.is_available()
+   if not avail then
+      print("PMU not available:")
+      print("  "..err)
+      print("Skipping benchmark.")
+   else
+      local n = 0
+      pmu.profile(function()
+         for i =0, 1000*1000*1000 do n = n + g(i, 7) end
+      end)
+   end
 end
 function selftest ()
    local n = LPM4_poptrie:new()

src/lib/lpm/random.dasl

@@ -29,16 +29,24 @@ Rand.u32 = (function()
 end)()
 
 function Rand:selftest()
-	local pmu = require("lib.pmu")
-	local v = 0
-	local million = 1000000
-	local start = C.get_time_ns()
-	pmu.profile(function()
-		for i=0, 500*million do
-			v = Rand.u32(v)
-		end
-	end, {}, { random_u32 = 500*million })
-	print((C.get_time_ns() - start)/(500*million))
+   local pmu = require("lib.pmu")
+   local v = 0
+   local million = 1000000
+   local function test()
+      for i=0, 500*million do
+         v = Rand.u32(v)
+      end
+   end
+   local avail, err = pmu.is_available()
+   local start = C.get_time_ns()
+   if not avail then
+      print("PMU not available:")
+      print("  "..err)
+      test()
+   else
+      pmu.profile(test, {}, { random_u32 = 500*million })
+   end
+   print(tonumber((C.get_time_ns() - start))/(500*million))
 end
 
 return Rand