#include "types.hh"
#include "util.hh"
#include "affinity.hh"

#if HAVE_SCHED_H
#include <sched.h>
#endif

namespace nix {


#if HAVE_SCHED_SETAFFINITY
static bool didSaveAffinity = false;
static cpu_set_t savedAffinity;
#endif


void setAffinityTo(int cpu)
{
#if HAVE_SCHED_SETAFFINITY
    if (sched_getaffinity(0, sizeof(cpu_set_t), &savedAffinity) == -1) return;
    didSaveAffinity = true;
    printMsg(lvlDebug, format("locking this thread to CPU %1%") % cpu);
    cpu_set_t newAffinity;
    CPU_ZERO(&newAffinity);
    CPU_SET(cpu, &newAffinity);
    if (sched_setaffinity(0, sizeof(cpu_set_t), &newAffinity) == -1)
        printMsg(lvlError, format("failed to lock thread to CPU %1%") % cpu);
#endif
}


int lockToCurrentCPU()
{
#if HAVE_SCHED_SETAFFINITY
    int cpu = sched_getcpu();
    if (cpu != -1) setAffinityTo(cpu);
    return cpu;
#else
    return -1;
#endif
}


void restoreAffinity()
{
#if HAVE_SCHED_SETAFFINITY
    if (!didSaveAffinity) return;
    if (sched_setaffinity(0, sizeof(cpu_set_t), &savedAffinity) == -1)
        printMsg(lvlError, "failed to restore affinity %1%");
#endif
}


}
 href='/guix/'>summary</a><a href='/guix/refs/?id=d9c9b97e93f21b2ece3f16a050e7c2935b60a03f'>refs</a><a class='active' href='/guix/log/gnu/bootloader/extlinux.scm'>log</a><a href='/guix/tree/gnu/bootloader/extlinux.scm?id=d9c9b97e93f21b2ece3f16a050e7c2935b60a03f'>tree</a><a href='/guix/commit/gnu/bootloader/extlinux.scm?id=d9c9b97e93f21b2ece3f16a050e7c2935b60a03f'>commit</a><a href='/guix/diff/gnu/bootloader/extlinux.scm?id=d9c9b97e93f21b2ece3f16a050e7c2935b60a03f'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/bootloader/extlinux.scm'>
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<div class='path'>path: <a href='/guix/log/?id=d9c9b97e93f21b2ece3f16a050e7c2935b60a03f'>root</a>/<a href='/guix/log/gnu?id=d9c9b97e93f21b2ece3f16a050e7c2935b60a03f'>gnu</a>/<a href='/guix/log/gnu/bootloader?id=d9c9b97e93f21b2ece3f16a050e7c2935b60a03f'>bootloader</a>/<a href='/guix/log/gnu/bootloader/extlinux.scm?id=d9c9b97e93f21b2ece3f16a050e7c2935b60a03f'>extlinux.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/bootloader/extlinux.scm?id=d9c9b97e93f21b2ece3f16a050e7c2935b60a03f&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-08-30 08:50:44 +0200'>2022-08-30</span></td><td><a href='/guix/commit/gnu/bootloader/extlinux.scm?id=f126f23b132148192b2c9a89032a5831af0b3c52'>bootloader: Add device-tree-support? option.</a><span class='msg-avail'>...<span class='msg-tooltip'>In some specific cases where the device tree file is already loaded in RAM, it
can be preferable that the bootloader does not try to use a device tree from
the Linux kernel tree.

* gnu/bootloader.scm (&lt;bootloader-configuration&gt;)[device-tree-support?]: New field.
* gnu/bootloader/extlinux.scm (extlinux-configuration-file): Add FDTDIR line
based on &lt;device-tree-support?&gt; field of &lt;bootloader-configuration&gt;.
* doc/guix.texi (Bootloader Configuration)[device-tree-support?]: Add
documentation for the new field.
</span></span></td><td>Reza Alizadeh Majd</td></tr>