if (SANITIZE OR NOT (ARCH_AMD64 OR ARCH_ARM) OR NOT (OS_LINUX OR OS_FREEBSD OR OS_DARWIN))
    if (ENABLE_JEMALLOC)
        message (${RECONFIGURE_MESSAGE_LEVEL}
                 "jemalloc is disabled implicitly: it doesn't work with sanitizers and can only be used with x86_64 or aarch64 on linux or freebsd.")
    endif()
    set (ENABLE_JEMALLOC OFF)
else()
    option (ENABLE_JEMALLOC "Enable jemalloc allocator" ${ENABLE_LIBRARIES})
endif ()

if (NOT ENABLE_JEMALLOC)
    add_library(jemalloc INTERFACE)
    target_compile_definitions(jemalloc INTERFACE USE_JEMALLOC=0)

    message (STATUS "Not using jemalloc")
    return()
endif ()

if (NOT OS_LINUX)
    message (WARNING "jemalloc support on non-linux is EXPERIMENTAL")
endif()

if (OS_LINUX)
    # ThreadPool select job randomly, and there can be some threads that had been
    # performed some memory heavy task before and will be inactive for some time,
    # but until it will became active again, the memory will not be freed since by
    # default each thread has it's own arena, but there should be not more then
    # 4*CPU arenas (see opt.nareans description).
    #
    # By enabling percpu_arena number of arenas limited to number of CPUs and hence
    # this problem should go away.
    #
    # muzzy_decay_ms -- use MADV_FREE when available on newer Linuxes, to
    # avoid spurious latencies and additional work associated with
    # MADV_DONTNEED. See
    # https://github.com/ClickHouse/ClickHouse/issues/11121 for motivation.
    set (JEMALLOC_CONFIG_MALLOC_CONF "percpu_arena:percpu,oversize_threshold:0,muzzy_decay_ms:10000")
else()
    set (JEMALLOC_CONFIG_MALLOC_CONF "oversize_threshold:0,muzzy_decay_ms:10000")
endif()
# CACHE variable is empty, to allow changing defaults without necessity
# to purge cache
set (JEMALLOC_CONFIG_MALLOC_CONF_OVERRIDE "" CACHE STRING "Change default configuration string of JEMalloc" )
if (JEMALLOC_CONFIG_MALLOC_CONF_OVERRIDE)
    set (JEMALLOC_CONFIG_MALLOC_CONF "${JEMALLOC_CONFIG_MALLOC_CONF_OVERRIDE}")
endif()
message (STATUS "jemalloc malloc_conf: ${JEMALLOC_CONFIG_MALLOC_CONF}")

set (LIBRARY_DIR "${ClickHouse_SOURCE_DIR}/contrib/jemalloc")

set (SRCS
    ${LIBRARY_DIR}/src/arena.c
    ${LIBRARY_DIR}/src/background_thread.c
    ${LIBRARY_DIR}/src/base.c
    ${LIBRARY_DIR}/src/bin.c
    ${LIBRARY_DIR}/src/bitmap.c
    ${LIBRARY_DIR}/src/ckh.c
    ${LIBRARY_DIR}/src/ctl.c
    ${LIBRARY_DIR}/src/div.c
    ${LIBRARY_DIR}/src/extent.c
    ${LIBRARY_DIR}/src/extent_dss.c
    ${LIBRARY_DIR}/src/extent_mmap.c
    ${LIBRARY_DIR}/src/hash.c
    ${LIBRARY_DIR}/src/hook.c
    ${LIBRARY_DIR}/src/jemalloc.c
    ${LIBRARY_DIR}/src/large.c
    ${LIBRARY_DIR}/src/log.c
    ${LIBRARY_DIR}/src/malloc_io.c
    ${LIBRARY_DIR}/src/mutex.c
    ${LIBRARY_DIR}/src/mutex_pool.c
    ${LIBRARY_DIR}/src/nstime.c
    ${LIBRARY_DIR}/src/pages.c
    ${LIBRARY_DIR}/src/prng.c
    ${LIBRARY_DIR}/src/prof.c
    ${LIBRARY_DIR}/src/rtree.c
    ${LIBRARY_DIR}/src/sc.c
    ${LIBRARY_DIR}/src/stats.c
    ${LIBRARY_DIR}/src/sz.c
    ${LIBRARY_DIR}/src/tcache.c
    ${LIBRARY_DIR}/src/test_hooks.c
    ${LIBRARY_DIR}/src/ticker.c
    ${LIBRARY_DIR}/src/tsd.c
    ${LIBRARY_DIR}/src/witness.c
    ${LIBRARY_DIR}/src/safety_check.c
)
if (OS_DARWIN)
    list(APPEND SRCS ${LIBRARY_DIR}/src/zone.c)
endif ()

add_library(jemalloc ${SRCS})
target_include_directories(jemalloc PRIVATE ${LIBRARY_DIR}/include)
target_include_directories(jemalloc SYSTEM PUBLIC include)

set (JEMALLOC_INCLUDE_PREFIX)
# OS_
if (OS_LINUX)
    set (JEMALLOC_INCLUDE_PREFIX "include_linux")
elseif (OS_FREEBSD)
    set (JEMALLOC_INCLUDE_PREFIX "include_freebsd")
elseif (OS_DARWIN)
    set (JEMALLOC_INCLUDE_PREFIX "include_darwin")
else ()
    message (FATAL_ERROR "internal jemalloc: This OS is not supported")
endif ()
# ARCH_
if (ARCH_AMD64)
    set(JEMALLOC_INCLUDE_PREFIX "${JEMALLOC_INCLUDE_PREFIX}_x86_64")
elseif (ARCH_ARM)
    set(JEMALLOC_INCLUDE_PREFIX "${JEMALLOC_INCLUDE_PREFIX}_aarch64")
else ()
    message (FATAL_ERROR "internal jemalloc: This arch is not supported")
endif ()

configure_file(${JEMALLOC_INCLUDE_PREFIX}/jemalloc/internal/jemalloc_internal_defs.h.in
    ${JEMALLOC_INCLUDE_PREFIX}/jemalloc/internal/jemalloc_internal_defs.h)
target_include_directories(jemalloc SYSTEM PRIVATE
    ${CMAKE_CURRENT_BINARY_DIR}/${JEMALLOC_INCLUDE_PREFIX}/jemalloc/internal)

target_compile_definitions(jemalloc PRIVATE -DJEMALLOC_NO_PRIVATE_NAMESPACE)

if (CMAKE_BUILD_TYPE_UC STREQUAL "DEBUG")
    target_compile_definitions(jemalloc PRIVATE -DJEMALLOC_DEBUG=1 -DJEMALLOC_PROF=1)

    if (USE_UNWIND)
        target_compile_definitions (jemalloc PRIVATE -DJEMALLOC_PROF_LIBUNWIND=1)
        target_link_libraries (jemalloc PRIVATE unwind)
    endif ()
endif ()

target_compile_options(jemalloc PRIVATE -Wno-redundant-decls)
# for RTLD_NEXT
target_compile_options(jemalloc PRIVATE -D_GNU_SOURCE)

set_property(TARGET jemalloc APPEND PROPERTY INTERFACE_COMPILE_DEFINITIONS USE_JEMALLOC=1)
if (MAKE_STATIC_LIBRARIES)
    # To detect whether we need to register jemalloc for osx as default zone.
    set_property(TARGET jemalloc APPEND PROPERTY INTERFACE_COMPILE_DEFINITIONS BUNDLED_STATIC_JEMALLOC=1)
endif()

message (STATUS "Using jemalloc")