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338523dd6e
Provide infrastructure to auto-configure to enum and API changes in the global page stats used for our free memory calculations. arc_free_memory has been broken since an API change in Linux v3.14: 2016-07-28 v4.8 599d0c95 mm, vmscan: move LRU lists to node 2016-07-28 v4.8 75ef7184 mm, vmstat: add infrastructure for per-node vmstats These commits moved some of global_page_state() into global_node_page_state(). The API change was particularly egregious as, instead of breaking the old code, it silently did the wrong thing and we continued using global_page_state() where we should have been using global_node_page_state(), thus indexing into the wrong array via NR_SLAB_RECLAIMABLE et al. There have been further API changes along the way: 2017-07-06 v4.13 385386cf mm: vmstat: move slab statistics from zone to node counters 2017-09-06 v4.14 c41f012a mm: rename global_page_state to global_zone_page_state ...and various (incomplete, as it turns out) attempts to accomodate these changes in ZoL: 2017-08-242209e409Linux 4.8+ compatibility fix for vm stats 2017-09-16787acae0Linux 3.14 compat: IO acct, global_page_state, etc 2017-09-19661907e6Linux 4.14 compat: IO acct, global_page_state, etc The config infrastructure provided here resolves these issues going back to the original API change in v3.14 and is robust against further Linux changes in this area. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: Chris Dunlop <chris@onthe.net.au> Closes #7170
59 lines
955 B
Perl
Executable File
59 lines
955 B
Perl
Executable File
#!/usr/bin/perl -w
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my $usage = <<EOT;
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usage: config-enum enum [file ...]
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Returns the elements from an enum declaration.
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"Best effort": we're not building an entire C interpreter here!
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EOT
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use warnings;
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use strict;
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use Getopt::Std;
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my %opts;
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if (!getopts("", \%opts) || @ARGV < 1) {
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print $usage;
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exit 2;
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}
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my $enum = shift;
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my $in_enum = 0;
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while (<>) {
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# comments
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s/\/\*.*\*\///;
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if (m/\/\*/) {
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while ($_ .= <>) {
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last if s/\/\*.*\*\///s;
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}
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}
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# preprocessor stuff
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next if /^#/;
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# find our enum
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$in_enum = 1 if s/^\s*enum\s+${enum}(?:\s|$)//;
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next unless $in_enum;
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# remove explicit values
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s/\s*=[^,]+,/,/g;
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# extract each identifier
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while (m/\b([a-z_][a-z0-9_]*)\b/ig) {
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print $1, "\n";
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}
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#
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# don't exit: there may be multiple versions of the same enum, e.g.
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# inside different #ifdef blocks. Let's explicitly return all of
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# them and let external tooling deal with it.
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#
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$in_enum = 0 if m/}\s*;/;
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}
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exit 0;
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