Messages in this thread Patch in this message | | | From | Avadhut Naik <> | Subject | [PATCH 2/2] x86/MCE: Add command line option to extend MCE Records pool | Date | Wed, 7 Feb 2024 16:56:32 -0600 |
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Extension of MCE Records pool, based on system's CPU count, was undertaken through the previous patch (x86/MCE: Extend size of the MCE Records pool).
Add a new command line parameter "mce-genpool-extend" to set the size of MCE Records pool to a predetermined number of pages instead of system's CPU count.
Signed-off-by: Avadhut Naik <avadhut.naik@amd.com> --- .../admin-guide/kernel-parameters.txt | 2 ++ arch/x86/kernel/cpu/mce/genpool.c | 22 ++++++++++++++++--- 2 files changed, 21 insertions(+), 3 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 3a1fa1f81d9d..62e7da4d9fda 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3135,6 +3135,8 @@ mce=option [X86-64] See Documentation/arch/x86/x86_64/boot-options.rst + mce-genpool-extend= [X86-64] Number of pages to add to MCE Records pool. + md= [HW] RAID subsystems devices and level See Documentation/admin-guide/md.rst. diff --git a/arch/x86/kernel/cpu/mce/genpool.c b/arch/x86/kernel/cpu/mce/genpool.c index aed01612d342..d6e04fa5ee07 100644 --- a/arch/x86/kernel/cpu/mce/genpool.c +++ b/arch/x86/kernel/cpu/mce/genpool.c @@ -22,6 +22,7 @@ #define MCE_POOLSZ (2 * PAGE_SIZE) #define CPU_GEN_MEMSZ 256 +static unsigned int mce_genpool_extend; static struct gen_pool *mce_evt_pool; static LLIST_HEAD(mce_event_llist); static char gen_pool_buf[MCE_POOLSZ]; @@ -123,10 +124,14 @@ int mce_gen_pool_extend(void) int ret = -ENOMEM; u32 num_threads; - num_threads = num_present_cpus(); - len = PAGE_ALIGN(num_threads * CPU_GEN_MEMSZ); - addr = (unsigned long)kzalloc(len, GFP_KERNEL); + if (mce_genpool_extend) { + len = mce_genpool_extend * PAGE_SIZE; + } else { + num_threads = num_present_cpus(); + len = PAGE_ALIGN(num_threads * CPU_GEN_MEMSZ); + } + addr = (unsigned long)kzalloc(len, GFP_KERNEL); if (!addr) goto out; @@ -159,6 +164,17 @@ static int mce_gen_pool_create(void) return ret; } +static int __init parse_mce_genpool_extend(char *str) +{ + if (*str == '=') + str++; + + get_option(&str, &mce_genpool_extend); + return 1; +} + +__setup("mce-genpool-extend", parse_mce_genpool_extend); + int mce_gen_pool_init(void) { /* Just init mce_gen_pool once. */ -- 2.34.1
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