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Makefile: Don't attempt to auto-detect stack size

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We probe the available stack limit in the Makefile using rlimit, then use
that to set the size of the stack when we clone() extra threads.  But
the rlimit at compile time need not be the same as the rlimit at runtime,
so that's not particularly sensible.

Ideally, we'd set the stack size based on an estimate of the actual
maximum stack usage of all our clone()ed functions.  We don't have that
at the moment, but to keep things simple just set it to 1MiB - that's what
the current probe will set things to on my default configuration Fedora 40,
so it's likely to be fine in most cases.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2024-11-06 10:25:26 +11:00 committed by Stefano Brivio
parent 13fc6d511e
commit c560e2f65b
2 changed files with 1 additions and 7 deletions
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6
Makefile
View File

@ -15,11 +15,6 @@ VERSION ?= $(shell git describe --tags HEAD 2>/dev/null || echo "unknown\ versio
# the IPv6 socket API? (Linux does)
DUAL_STACK_SOCKETS := 1
RLIMIT_STACK_VAL := $(shell /bin/sh -c 'ulimit -s')
ifeq ($(RLIMIT_STACK_VAL),unlimited)
RLIMIT_STACK_VAL := 1024
endif
TARGET ?= $(shell $(CC) -dumpmachine)
# Get 'uname -m'-like architecture description for target
TARGET_ARCH := $(shell echo $(TARGET) | cut -f1 -d- | tr [A-Z] [a-z])
@ -36,7 +31,6 @@ FLAGS := -Wall -Wextra -Wno-format-zero-length
FLAGS += -pedantic -std=c11 -D_XOPEN_SOURCE=700 -D_GNU_SOURCE
FLAGS += $(FORTIFY_FLAG) -O2 -pie -fPIE
FLAGS += -DPAGE_SIZE=$(shell getconf PAGE_SIZE)
FLAGS += -DRLIMIT_STACK_VAL=$(RLIMIT_STACK_VAL)
FLAGS += -DVERSION=\"$(VERSION)\"
FLAGS += -DDUAL_STACK_SOCKETS=$(DUAL_STACK_SOCKETS)

2
util.h
View File

@ -132,7 +132,7 @@ static inline uint32_t ntohl_unaligned(const void *p)
return ntohl(val);
}
#define NS_FN_STACK_SIZE (RLIMIT_STACK_VAL * 1024 / 8)
#define NS_FN_STACK_SIZE (1024 * 1024) /* 1MiB */
int do_clone(int (*fn)(void *), char *stack_area, size_t stack_size, int flags,
void *arg);
#define NS_CALL(fn, arg) \