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author | Eric Dumazet <dada1@cosmosbay.com> | 2008-05-12 13:44:40 (GMT) |
---|---|---|
committer | Thomas Gleixner <tglx@linutronix.de> | 2008-05-25 05:03:46 (GMT) |
commit | 63cc8c75156462d4b42cbdd76c293b7eee7ddbfe (patch) | |
tree | e014b4c61399f8f74347352e6ea76ddf1502dcfa /arch/x86/kernel/vmlinux_32.lds.S | |
parent | 75d3bce2fc0a80f435fe12f2c9ed2632c8ac29e4 (diff) | |
download | linux-fsl-qoriq-63cc8c75156462d4b42cbdd76c293b7eee7ddbfe.tar.xz |
percpu: introduce DEFINE_PER_CPU_PAGE_ALIGNED() macro
While examining holes in percpu section I found this :
c05f5000 D per_cpu__current_task
c05f5000 D __per_cpu_start
c05f5004 D per_cpu__cpu_number
c05f5008 D per_cpu__irq_regs
c05f500c d per_cpu__cpu_devices
c05f5040 D per_cpu__cyc2ns
<Big Hole of about 4000 bytes>
c05f6000 d per_cpu__cpuid4_info
c05f6004 d per_cpu__cache_kobject
c05f6008 d per_cpu__index_kobject
<Big Hole of about 4000 bytes>
c05f7000 D per_cpu__gdt_page
This is because gdt_page is a percpu variable, defined with
a page alignement, and linker is doing its job, two times because of .o
nesting in the build process.
I introduced a new macro DEFINE_PER_CPU_PAGE_ALIGNED() to avoid
wasting this space. All page aligned variables (only one at this time)
are put in a separate
subsection .data.percpu.page_aligned, at the very begining of percpu zone.
Before patch , on a x86_32 machine :
.data.percpu 30232 3227471872
.data.percpu 22168 3227471872
Thats 8064 bytes saved for each CPU.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/vmlinux_32.lds.S')
-rw-r--r-- | arch/x86/kernel/vmlinux_32.lds.S | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kernel/vmlinux_32.lds.S b/arch/x86/kernel/vmlinux_32.lds.S index ce5ed08..0f7c29a 100644 --- a/arch/x86/kernel/vmlinux_32.lds.S +++ b/arch/x86/kernel/vmlinux_32.lds.S @@ -189,6 +189,7 @@ SECTIONS . = ALIGN(PAGE_SIZE); .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { __per_cpu_start = .; + *(.data.percpu.page_aligned) *(.data.percpu) *(.data.percpu.shared_aligned) __per_cpu_end = .; |