diff --git a/lib/_emerge/Scheduler.py b/lib/_emerge/Scheduler.py
index 614df9e783..27385b7709 100644
--- a/lib/_emerge/Scheduler.py
+++ b/lib/_emerge/Scheduler.py
@@ -26,6 +26,7 @@
 from portage._sets.base import InternalPackageSet
 from portage.util import ensure_dirs, writemsg, writemsg_level
 from portage.util.futures import asyncio
+from portage.util.path import first_existing
 from portage.util.SlotObject import SlotObject
 from portage.util._async.SchedulerInterface import SchedulerInterface
 from portage.package.ebuild.digestcheck import digestcheck
@@ -64,7 +65,7 @@
 
 
 class Scheduler(PollScheduler):
-    # max time between loadavg checks (seconds)
+    # max time between loadavg and tmpdir space checks (seconds)
     _loadavg_latency = 30
 
     # max time between display status updates (seconds)
@@ -229,6 +230,7 @@ def __init__(
         if max_jobs is None:
             max_jobs = 1
         self._set_max_jobs(max_jobs)
+        self._jobs_tmpdir_space_threshold = myopts.get("--jobs-tmpdir-space-threshold")
         self._running_root = trees[trees._running_eroot]["root_config"]
         self.edebug = 0
         if settings.get("PORTAGE_DEBUG", "") == "1":
@@ -1573,7 +1575,10 @@ def _main_loop(self):
         self._main_exit = self._event_loop.create_future()
 
         if (
-            self._max_load is not None
+            (
+                self._max_load is not None
+                or self._jobs_tmpdir_space_threshold is not None
+            )
             and self._loadavg_latency is not None
             and (self._max_jobs is True or self._max_jobs > 1)
         ):
@@ -1792,6 +1797,30 @@ def _is_work_scheduled(self):
     def _running_job_count(self):
         return self._jobs
 
+    def _can_add_job(self):
+        if not super()._can_add_job():
+            return False
+
+        if self._jobs_tmpdir_space_threshold is not None and hasattr(os, "statvfs"):
+            tmpdir = first_existing(
+                os.path.join(self.settings["PORTAGE_TMPDIR"], "portage")
+            )
+            try:
+                vfs_stat = os.statvfs(tmpdir)
+            except OSError as e:
+                writemsg_level(
+                    f"!!! statvfs('{tmpdir}'): {e}\n",
+                    noiselevel=-1,
+                    level=logging.ERROR,
+                )
+            else:
+                if (
+                    (vfs_stat.f_blocks - vfs_stat.f_bavail) / vfs_stat.f_blocks
+                ) > self._jobs_tmpdir_space_threshold:
+                    return False
+
+        return True
+
     def _schedule_tasks(self):
         while True:
             state_change = 0
diff --git a/lib/_emerge/main.py b/lib/_emerge/main.py
index 465e20163d..18ccd76f1b 100644
--- a/lib/_emerge/main.py
+++ b/lib/_emerge/main.py
@@ -1,4 +1,4 @@
-# Copyright 1999-2023 Gentoo Authors
+# Copyright 1999-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 import argparse
@@ -165,6 +165,7 @@ def __contains__(self, s):
         "--getbinpkgonly": y_or_n,
         "--ignore-world": y_or_n,
         "--jobs": valid_integers,
+        "--jobs-tmpdir-space-threshold": valid_floats,
         "--keep-going": y_or_n,
         "--load-average": valid_floats,
         "--onlydeps-with-ideps": y_or_n,
@@ -523,6 +524,10 @@ def parse_opts(tmpcmdline, silent=False):
             "help": "Specifies the number of packages to build " + "simultaneously.",
             "action": "store",
         },
+        "--jobs-tmpdir-space-threshold": {
+            "help": "Specifies maximum used space ratio when starting a new job.",
+            "action": "store",
+        },
         "--keep-going": {
             "help": "continue as much as possible after an error",
             "choices": true_y_or_n,
@@ -1033,6 +1038,24 @@ def parse_opts(tmpcmdline, silent=False):
 
         myoptions.jobs = jobs
 
+    if myoptions.jobs_tmpdir_space_threshold == "True":
+        myoptions.jobs_tmpdir_space_threshold = None
+
+    if myoptions.jobs_tmpdir_space_threshold:
+        try:
+            jobs_tmpdir_space_threshold = float(myoptions.jobs_tmpdir_space_threshold)
+        except ValueError:
+            jobs_tmpdir_space_threshold = 0.0
+
+        if jobs_tmpdir_space_threshold <= 0.0 or jobs_tmpdir_space_threshold > 1.0:
+            jobs_tmpdir_space_threshold = None
+            if not silent:
+                parser.error(
+                    f"Invalid --jobs-tmpdir-space-threshold: '{myoptions.jobs_tmpdir_space_threshold}'\n"
+                )
+
+        myoptions.jobs_tmpdir_space_threshold = jobs_tmpdir_space_threshold
+
     if myoptions.load_average == "True":
         myoptions.load_average = None
 
@@ -1304,6 +1327,16 @@ def emerge_main(args: Optional[list[str]] = None):
     emerge_config.action, emerge_config.opts, emerge_config.args = parse_opts(
         tmpcmdline
     )
+    if (
+        "--jobs-tmpdir-space-threshold" in emerge_config.opts
+        and "keep-work" in emerge_config.running_config.settings.features
+    ):
+        writemsg_level(
+            "--jobs-tmpdir-space-threshold conflicts with FEATURES=keep-work\n",
+            level=logging.ERROR,
+            noiselevel=-1,
+        )
+        return 1
 
     try:
         return run_action(emerge_config)
diff --git a/man/emerge.1 b/man/emerge.1
index e30f5f813e..cee38f8ce4 100644
--- a/man/emerge.1
+++ b/man/emerge.1
@@ -1,4 +1,4 @@
-.TH "EMERGE" "1" "May 2024" "Portage @VERSION@" "Portage"
+.TH "EMERGE" "1" "Jun 2024" "Portage @VERSION@" "Portage"
 .SH "NAME"
 emerge \- Command\-line interface to the Portage system
 .SH "SYNOPSIS"
@@ -693,6 +693,14 @@ Note that interactive packages currently force a setting
 of \fI\-\-jobs=1\fR. This issue can be temporarily avoided
 by specifying \fI\-\-accept\-properties=\-interactive\fR.
 .TP
+.BR \-\-jobs\-tmpdir\-space\-threshold[=RATIO]
+Specifies the maximum ratio of used space allowed (a floating\-point
+number) in \fBPORTAGE_TMPDIR\fR when starting a new job. With no
+argument, removes a previous space ratio threshold. For example,
+use a ratio of \fI0.85\fR to stop starting new jobs when the space
+usage in \fBPORTAGE_TMPDIR\fR exceeds \fI85%\fR. This option conflicts
+with \fBFEATURES="keep\-work"\fR.
+.TP
 .BR "\-\-keep\-going [ y | n ]"
 Continue as much as possible after an error. When an error occurs,
 dependencies are recalculated for remaining packages and any with