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Revision b17faba03fc72091f4d040b879def004316952ec authored by Shyam Sundar S K on 07 December 2016, 17:07:05 UTC, committed by Jon Mason on 23 December 2016, 21:10:35 UTC 
ntb_transport: Limit memory windows based on available, scratchpads
 
When the underlying NTB H/W driver advertises more memory windows
than the number of scratchpads available to setup MW's, it is likely
that we may end up filling the remaining memory windows with garbage.
So to avoid that, lets limit the memory windows that transport driver
can setup based on the available scratchpads.

Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Acked-by: Allen Hubbe <Allen.Hubbe@dell.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
1 parent 872deb2
Raw File
bloat-o-meter 
#!/usr/bin/python
#
# Copyright 2004 Matt Mackall <mpm@selenic.com>
#
# inspired by perl Bloat-O-Meter (c) 1997 by Andi Kleen
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.

import sys, os, re
from signal import signal, SIGPIPE, SIG_DFL

signal(SIGPIPE, SIG_DFL)

if len(sys.argv) != 3:
    sys.stderr.write("usage: %s file1 file2\n" % sys.argv[0])
    sys.exit(-1)

def getsizes(file):
    sym = {}
    for l in os.popen("nm --size-sort " + file).readlines():
        size, type, name = l[:-1].split()
        if type in "tTdDbBrR":
            # strip generated symbols
            if name.startswith("__mod_"): continue
            if name.startswith("SyS_"): continue
            if name.startswith("compat_SyS_"): continue
            if name == "linux_banner": continue
            # statics and some other optimizations adds random .NUMBER
            name = re.sub(r'\.[0-9]+', '', name)
            sym[name] = sym.get(name, 0) + int(size, 16)
    return sym

old = getsizes(sys.argv[1])
new = getsizes(sys.argv[2])
grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
delta, common = [], {}
otot, ntot = 0, 0

for a in old:
    if a in new:
        common[a] = 1

for name in old:
    otot += old[name]
    if name not in common:
        remove += 1
        down += old[name]
        delta.append((-old[name], name))

for name in new:
    ntot += new[name]
    if name not in common:
        add += 1
        up += new[name]
        delta.append((new[name], name))

for name in common:
        d = new.get(name, 0) - old.get(name, 0)
        if d>0: grow, up = grow+1, up+d
        if d<0: shrink, down = shrink+1, down-d
        delta.append((d, name))

delta.sort()
delta.reverse()

print("add/remove: %s/%s grow/shrink: %s/%s up/down: %s/%s (%s)" % \
      (add, remove, grow, shrink, up, -down, up-down))
print("%-40s %7s %7s %+7s" % ("function", "old", "new", "delta"))
for d, n in delta:
    if d: print("%-40s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d))

print("Total: Before=%d, After=%d, chg %+.2f%%" % \
    (otot, ntot, (ntot - otot)*100.0/otot))
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