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Offer DMA latency matching state transitions for the given CPU

This commit is contained in:
Robin Gareus 2021-06-10 23:42:48 +02:00
parent b67d783cd6
commit e22720f59a
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
1 changed files with 29 additions and 16 deletions
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45
gtk2_ardour/rc_option_editor.cc
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@ -42,6 +42,7 @@
#include "gtkmm2ext/gtk_ui.h"
#include "gtkmm2ext/window_title.h"
#include "pbd/file_utils.h"
#include "pbd/fpu.h"
#include "pbd/cpus.h"
#include "pbd/unwind.h"
@ -4376,24 +4377,36 @@ These settings will only take effect after %1 is restarted.\n\
sigc::mem_fun (*_rc_config, &RCConfiguration::set_cpu_dma_latency)
);
cpudma->add (-1, _("Unset"));
cpudma->add (0, _("Lowest (prevent CPU sleep states)"));
cpudma->add (5, _("5 usec"));
cpudma->add (55, _("55 usec"));
cpudma->add (100, _("100 usec"));
set<int> lvalues;
vector<string> latency_files;
Searchpath sp ("/sys/devices/system/cpu/cpu0/cpuidle/");
find_files_matching_regex (latency_files, sp, "latency$", true);
for (vector<string>::const_iterator i = latency_files.begin(); i != latency_files.end (); ++i) {
try {
std::string l = Glib::file_get_contents (*i);
int lv = atoi (l.c_str());
if (lv > 0) {
lvalues.insert (lv);
}
} catch (...) { }
}
if (lvalues.empty ()) {
lvalues.insert (5);
lvalues.insert (55);
lvalues.insert (100);
}
int32_t cpudma_val = _rc_config->get_cpu_dma_latency ();
switch (cpudma_val) {
case -1:
case 0:
case 5:
case 55:
case 100:
break;
default:
if (cpudma_val > 0) {
cpudma->add (cpudma_val, string_compose (_("%1 usec"), cpudma_val));
}
if (cpudma_val > 0) {
lvalues.insert (cpudma_val);
}
cpudma->add (-1, _("Unset"));
cpudma->add (0, _("Lowest (prevent CPU sleep states)"));
for (set<int>::const_iterator i = lvalues.begin(); i != lvalues.end (); ++i) {
cpudma->add (*i, string_compose (_("%1 usec"), *i));
}
cpudma->set_note (_("This setting requires write access to `/dev/cpu_dma_latency' to set the maximum tolerable CPU DMA latency"));