x86: Reduce Memory Usage for large CPU count systems
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- v1 Latest1 patch 1 replyIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/1 | x86: Convert cpuinfo_x86 array to a per_cpu arrayarch/ arch/ arch/ +37 more | +138 | 1 reply |
Reviews trailers per patch
The patch has a Reviewed-by or Acked-by.
| Patch | Christoph Lameter |
|---|---|
| 1/1 | A-b |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH 0/1] x86: Reduce Memory Usage for large CPU count systems
Analyzing various data structures when NR_CPU count is raised to 4096 shows the following arrays over 128k. If the maximum number of cpus are not installed (about 99.99% of the time), then a large percentage of this memory is wasted. --
151289856 CALNDATA irq_desc 135530496 RMDATATA irq_cfg 3145728 CALNDATA cpu_data 2101248 BSS irq_lists 2097152 RMDATATA cpu_sibling_map 2097152 RMDATATA cpu_core_map 1575936 BSS irq_2_pin 1050624 BSS irq_timer_state 614400 INITDATA early_node_map 525376 PERCPU per_cpu__kstat 524608 DATA unix_proto 524608 DATA udpv6_prot 524608 DATA udplitev6_prot 524608 DATA udplite_prot 524608 DATA udp_prot 524608 DATA tcpv6_prot 524608 DATA tcp_prot 524608 DATA rawv6_prot 524608 DATA raw_prot 524608 DATA packet_proto 524608 DATA netlink_proto 524288 BSS cpu_devices 524288 BSS boot_pageset 524288 CALNDATA boot_cpu_pda 262144 RMDATATA node_to_cpumask 262144 BSS __log_buf 131072 BSS entries
cpu_sibling_map and cpu_core_map have been taken care of in a prior patch. This patch deals with the cpu_data array of cpuinfo_x86 structs. The model that was used in sparc64 architecture was adopted for x86.
Obviously, the IRQ arrays are of greater importance for size reduction. Any suggestions, or threads I should read are gratefully accecpted... ;-)
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