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Message-ID: <eccb51f0-9696-a2b1-8fc2-aeb79f53e382@c-s.fr>
Date: Fri, 26 Apr 2019 08:49:44 +0200
From: Christophe Leroy <christophe.leroy@....fr>
To: "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 11/11] powerpc/mm: drop slice DEBUG
Le 26/04/2019 à 08:44, Aneesh Kumar K.V a écrit :
> Christophe Leroy <christophe.leroy@....fr> writes:
>
>> slice is now an improved functionnality. Drop the DEBUG stuff.
>>
>
> I would like to keep that. I helped a lot when moving address ranges and
> it should not have any runtime impact.
Ok for me.
Christophe
>
>
>> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
>> ---
>> arch/powerpc/mm/slice.c | 62 ++++---------------------------------------------
>> 1 file changed, 4 insertions(+), 58 deletions(-)
>>
>> diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
>> index 97fbf7b54422..a9d803738b65 100644
>> --- a/arch/powerpc/mm/slice.c
>> +++ b/arch/powerpc/mm/slice.c
>> @@ -41,28 +41,6 @@
>>
>> static DEFINE_SPINLOCK(slice_convert_lock);
>>
>> -#ifdef DEBUG
>> -int _slice_debug = 1;
>> -
>> -static void slice_print_mask(const char *label, const struct slice_mask *mask)
>> -{
>> - if (!_slice_debug)
>> - return;
>> - pr_devel("%s low_slice: %*pbl\n", label,
>> - (int)SLICE_NUM_LOW, &mask->low_slices);
>> - pr_devel("%s high_slice: %*pbl\n", label,
>> - (int)SLICE_NUM_HIGH, mask->high_slices);
>> -}
>> -
>> -#define slice_dbg(fmt...) do { if (_slice_debug) pr_devel(fmt); } while (0)
>> -
>> -#else
>> -
>> -static void slice_print_mask(const char *label, const struct slice_mask *mask) {}
>> -#define slice_dbg(fmt...)
>> -
>> -#endif
>> -
>> static inline bool slice_addr_is_low(unsigned long addr)
>> {
>> u64 tmp = (u64)addr;
>> @@ -207,9 +185,6 @@ static void slice_convert(struct mm_struct *mm,
>> unsigned long i, flags;
>> int old_psize;
>>
>> - slice_dbg("slice_convert(mm=%p, psize=%d)\n", mm, psize);
>> - slice_print_mask(" mask", mask);
>> -
>> psize_mask = slice_mask_for_size(&mm->context, psize);
>>
>> /* We need to use a spinlock here to protect against
>> @@ -255,10 +230,6 @@ static void slice_convert(struct mm_struct *mm,
>> (((unsigned long)psize) << (mask_index * 4));
>> }
>>
>> - slice_dbg(" lsps=%lx, hsps=%lx\n",
>> - (unsigned long)mm_ctx_low_slices(&mm->context),
>> - (unsigned long)mm_ctx_high_slices(&mm->context));
>> -
>> spin_unlock_irqrestore(&slice_convert_lock, flags);
>>
>> copro_flush_all_slbs(mm);
>> @@ -485,14 +456,9 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
>> BUG_ON(mm_ctx_slb_addr_limit(&mm->context) == 0);
>> VM_BUG_ON(radix_enabled());
>>
>> - slice_dbg("slice_get_unmapped_area(mm=%p, psize=%d...\n", mm, psize);
>> - slice_dbg(" addr=%lx, len=%lx, flags=%lx, topdown=%d\n",
>> - addr, len, flags, topdown);
>> -
>> /* If hint, make sure it matches our alignment restrictions */
>> if (!fixed && addr) {
>> addr = _ALIGN_UP(addr, page_size);
>> - slice_dbg(" aligned addr=%lx\n", addr);
>> /* Ignore hint if it's too large or overlaps a VMA */
>> if (addr > high_limit - len || addr < mmap_min_addr ||
>> !slice_area_is_free(mm, addr, len))
>> @@ -538,17 +504,12 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
>> slice_copy_mask(&good_mask, maskp);
>> }
>>
>> - slice_print_mask(" good_mask", &good_mask);
>> - if (compat_maskp)
>> - slice_print_mask(" compat_mask", compat_maskp);
>> -
>> /* First check hint if it's valid or if we have MAP_FIXED */
>> if (addr != 0 || fixed) {
>> /* Check if we fit in the good mask. If we do, we just return,
>> * nothing else to do
>> */
>> if (slice_check_range_fits(mm, &good_mask, addr, len)) {
>> - slice_dbg(" fits good !\n");
>> newaddr = addr;
>> goto return_addr;
>> }
>> @@ -558,13 +519,10 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
>> */
>> newaddr = slice_find_area(mm, len, &good_mask,
>> psize, topdown, high_limit);
>> - if (newaddr != -ENOMEM) {
>> - /* Found within the good mask, we don't have to setup,
>> - * we thus return directly
>> - */
>> - slice_dbg(" found area at 0x%lx\n", newaddr);
>> +
>> + /* Found within good mask, don't have to setup, thus return directly */
>> + if (newaddr != -ENOMEM)
>> goto return_addr;
>> - }
>> }
>> /*
>> * We don't fit in the good mask, check what other slices are
>> @@ -572,11 +530,9 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
>> */
>> slice_mask_for_free(mm, &potential_mask, high_limit);
>> slice_or_mask(&potential_mask, &potential_mask, &good_mask);
>> - slice_print_mask(" potential", &potential_mask);
>>
>> if (addr != 0 || fixed) {
>> if (slice_check_range_fits(mm, &potential_mask, addr, len)) {
>> - slice_dbg(" fits potential !\n");
>> newaddr = addr;
>> goto convert;
>> }
>> @@ -586,18 +542,14 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
>> if (fixed)
>> return -EBUSY;
>>
>> - slice_dbg(" search...\n");
>> -
>> /* If we had a hint that didn't work out, see if we can fit
>> * anywhere in the good area.
>> */
>> if (addr) {
>> newaddr = slice_find_area(mm, len, &good_mask,
>> psize, topdown, high_limit);
>> - if (newaddr != -ENOMEM) {
>> - slice_dbg(" found area at 0x%lx\n", newaddr);
>> + if (newaddr != -ENOMEM)
>> goto return_addr;
>> - }
>> }
>>
>> /* Now let's see if we can find something in the existing slices
>> @@ -618,8 +570,6 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
>> return -ENOMEM;
>>
>> slice_range_to_mask(newaddr, len, &potential_mask);
>> - slice_dbg(" found potential area at 0x%lx\n", newaddr);
>> - slice_print_mask(" mask", &potential_mask);
>>
>> convert:
>> /*
>> @@ -697,8 +647,6 @@ void slice_init_new_context_exec(struct mm_struct *mm)
>> struct slice_mask *mask;
>> unsigned int psize = mmu_virtual_psize;
>>
>> - slice_dbg("slice_init_new_context_exec(mm=%p)\n", mm);
>> -
>> /*
>> * In the case of exec, use the default limit. In the
>> * case of fork it is just inherited from the mm being
>> @@ -730,8 +678,6 @@ void slice_setup_new_exec(void)
>> {
>> struct mm_struct *mm = current->mm;
>>
>> - slice_dbg("slice_setup_new_exec(mm=%p)\n", mm);
>> -
>> if (!is_32bit_task())
>> return;
>>
>> --
>> 2.13.3
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