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 8fFGaNo0 Dxup4HXnusbMRK/kZN2f6Nd5ZsrezLIuPXwDJFXsALOF0Z4o4gv9QIfQjUERruxhVqoOWtzv0KfdBStr2TZWU14EqRF46vZc+m8/jRiLZ2NsZaZ3zFjZNQG3dLkdHw5dwHloIDgG7gX8WAtY3vLv9YWvaIVJMheUml8LZMDSPeEM90ct2qbUJoZrCaodnvtbKsI4+3/ivo0NrzXO915vR+yxhFA2Mu55D3BIrQ7j4+oWrs3IFqKmdr9MXMfJJxPOYLmC0w+NmdO2diOuT6CwZ8qwcHbkAvxm21r+Ept4K9SjPDsPXBn3yHIv1vyicCiulJAZNmT2LqAkyD//DM+PxJk0BOQB3K/zpl7BLqHCMvTMS1PdjPQNL8MOF1qE/2DxcKza0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: >>>> >>>> https://github.com/lattera/glibc/blob/master/nptl/allocatestack.c#L384 >>>> https://github.com/lattera/glibc/blob/master/nptl/pthread_create.c#L576 >>> >>> It explains the problem. The madvise() does have some extra overhead >>> for handling THP (splitting pmd, deferred split queue, etc). >>> >>>> >>>> Another thing is whether it's worthy to make stack use THP? It may be >>>> useful for some apps which need large stack size? >>> >>> Kernel actually doesn't apply THP to stack (see >>> vma_is_temporary_stack()). But kernel can't know whether the VMA is >>> stack or not by checking VM_GROWSDOWN | VM_GROWSUP flags. So if glibc >>> doesn't set the proper flags to tell kernel the area is stack, kernel >>> just treats it as normal anonymous area. So glibc should set up stack >>> properly IMHO. >> >> If I read the code correctly, nptl allocates stack by the below code: >> >> mem = __mmap (NULL, size, (guardsize == 0) ? prot : PROT_NONE, >>                          MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0); >> >> See >> https://github.com/lattera/glibc/blob/master/nptl/allocatestack.c#L563 >> >> The MAP_STACK is used, but it is a no-op on Linux. So the alternative >> is to make MAP_STACK useful on Linux instead of changing glibc. But >> the blast radius seems much wider. > Yes. MAP_STACK is also mentioned in manpage of mmap. I did test to > filter out of the MAP_STACK mapping based on this patch. The regression > in stress-ng.pthread was gone. I suppose this is kind of safe because > the madvise call is only applied to glibc allocated stack. The patch I tested against stress-ng.pthread: diff --git a/mm/mmap.c b/mm/mmap.c index b78e83d351d2..1fd510aef82e 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1829,7 +1829,8 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, */ pgoff = 0; get_area = shmem_get_unmapped_area; - } else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) { + } else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && + !(flags & MAP_STACK)) { /* Ensures that larger anonymous mappings are THP aligned. */ get_area = thp_get_unmapped_area; } > > > But what I am not sure was whether it's worthy to do such kind of change > as the regression only is seen obviously in micro-benchmark. No evidence > showed the other regressionsin this report is related with madvise. At > least from the perf statstics. Need to check more on stream/ramspeed. > Thanks. > > > Regards > Yin, Fengwei > >> >>> >>>> >>>> >>>> Regards >>>> Yin, Fengwei