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Thu, 16 Oct 2025 10:17:47 +0000 (GMT) From: Sumanth Korikkar To: Karel Zak , util-linux@vger.kernel.org Cc: Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Sumanth Korikkar Subject: [PATCH 1/6] lsmem: display global memmap on memory parameter Date: Thu, 16 Oct 2025 12:16:48 +0200 Message-ID: <20251016101701.552597-2-sumanthk@linux.ibm.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20251016101701.552597-1-sumanthk@linux.ibm.com> References: <20251016101701.552597-1-sumanthk@linux.ibm.com> Precedence: bulk X-Mailing-List: util-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=M5ZA6iws c=1 sm=1 tr=0 ts=68f0c650 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=x6icFKpwvdMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=w9e5aAkKI-zt_GHOaJgA:9 X-Proofpoint-GUID: My9on3_YqCum1djx9Ycy2Epr6ibcqTRT X-Proofpoint-ORIG-GUID: My9on3_YqCum1djx9Ycy2Epr6ibcqTRT X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDEwMDE0MCBTYWx0ZWRfXykk9ck4jXblw omZ1aa2HUenQoPCb7ExqD0ZbH4RO98inZsmjq3U86Qe1m3WuSx/IW8248M3YTNiiM8oQqyrUQTa eQKInCAs01VNk3e1G5IZVTyVCStqY5Jkz39cCB2XpuClGuKEkkB9MMTpSXAeSIrMYIt8PEbHzUm 0bH6jScsJUIjWyORtLuvuvK9Q+GF3NiPwlVFhIDQXbr1n5cinRk/EbTSU/pyl6riRegRl7904eO XkeSt4LDas2MSEJeIi4Eonl16F18YHk3rRFFcr2Zy5xhaOxqEDQdR+oj6UI3ljtW/SWv3/YDO3i eVnNwBs95DfMWh0tN2Tjwdts1+Vkp7K8Y/LmUZ5IaQoTj/GcM3la0eE2GvjOGwlH+LFEqsPOP2E hDslGNhLJ8WxcNm/AJknA+lruFIWzg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-16_01,2025-10-13_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 spamscore=0 clxscore=1015 impostorscore=0 phishscore=0 adultscore=0 suspectscore=0 priorityscore=1501 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510020000 definitions=main-2510100140 Display the output of global memmap-on-memory parameter for memory hotplug. Retrieve the details via /sys/module/memory_hotplug/parameters/memmap_on_memory. lsmem RANGE SIZE STATE REMOVABLE BLOCK 0x0000000000000000-0x00000001ffffffff 8G online yes 0-63 Memory block size: 128M Total online memory: 8G Total offline memory: 0B Memmap on memory parameter: yes Signed-off-by: Sumanth Korikkar --- sys-utils/lsmem.1.adoc | 2 ++ sys-utils/lsmem.c | 29 +++++++++++++++++++++++++++++ 2 files changed, 31 insertions(+) diff --git a/sys-utils/lsmem.1.adoc b/sys-utils/lsmem.1.adoc index d588051a8..9c9397631 100644 --- a/sys-utils/lsmem.1.adoc +++ b/sys-utils/lsmem.1.adoc @@ -28,6 +28,8 @@ Not all columns are supported on all systems. If an unsupported column is specif Use the *--help* option to see the columns description. +Memmap on memory parameter output displays the globally enabled memmap-on-memory setting for memory_hotplug. This is typically set on the kernel command line via memory_hotplug.memmap_on_memory. + == OPTIONS *-a*, *--all*:: diff --git a/sys-utils/lsmem.c b/sys-utils/lsmem.c index 39967bfc9..ea818d6dc 100644 --- a/sys-utils/lsmem.c +++ b/sys-utils/lsmem.c @@ -306,8 +306,25 @@ static void fill_scols_table(struct lsmem *lsmem) add_scols_line(lsmem, &lsmem->blocks[i]); } +static int get_memmap_mode(char *res, char *src, int len) +{ + if (!strncmp(src, "Y", 1)) + strncpy(res, "yes", len); + else if (!strncmp(src, "N", 1)) + strncpy(res, "no", len); + else if (!strncmp(src, "force", 5)) + strncpy(res, "force", len); + else + return -1; + return 0; +} + static void print_summary(struct lsmem *lsmem) { + const char *path = "/sys/module/memory_hotplug/parameters/memmap_on_memory"; + char buf[8], res[8]; + FILE *memmap; + if (lsmem->bytes) { printf("%-32s %15"PRId64"\n",_("Memory block size:"), lsmem->block_size); printf("%-32s %15"PRId64"\n",_("Total online memory:"), lsmem->mem_online); @@ -327,6 +344,18 @@ static void print_summary(struct lsmem *lsmem) printf("%-32s %5s\n",_("Total offline memory:"), p); free(p); } + memmap = fopen(path, "r"); + if (!memmap) + return; + if (fgets(buf, sizeof(buf), memmap)) { + if (!get_memmap_mode(res, buf, sizeof(res))) { + if (lsmem->bytes) + printf("%-32s %15s\n", _("Memmap on memory parameter:"), res); + else + printf("%-32s %5s\n", _("Memmap on memory parameter:"), res); + } + } + fclose(memmap); } static int memory_block_get_node(struct lsmem *lsmem, char *name) -- 2.48.1